13 Ejercicios de repasoEn los ejercicios 1 y 2, trazar la gráfica de la superficie de nivelf(x, y, z) = c en el valor dado de c.3. Conjetura Considerar la función f(x, y) = x 2 + y 2 .a) Trazar la gráfica de la superficie dada por f.b) Conjeturar la relación entre las gráficas de f y g(x, y) =f(x, y) + 2. Explicar el razonamiento.c) Conjeturar la relación entre las gráficas de f y g(x, y) =f(x, y – 2). Explicar el razonamiento.d) Sobre la superficie en el inciso a), trazar las gráficas dez = f(1, y) y z = f(x, 1).4. Conjetura Considerar la funcióna) Trazar la gráfica de la superficie dada por f.b) Conjeturar la relación entre las gráficas de f y g(x, y) = f(x + 2, y).Explicar el razonamiento.c) Conjeturar la relación entre las gráficas de f y g(x, y) = 4 –f(x, y). Explicar el razonamiento.d) Sobre la superficie en el inciso a), trazar las gráficas de z =f(0, y) y z = f(x, 0).En los ejercicios 5 a 8, utilizar un sistema algebraico por computadoray representar gráficamente algunas de las curvas de nivelde la función.5. 6.7. 8.En los ejercicios 9 y 10, utilizar un sistema algebraico por computadoray representar gráficamente la función.9. 10.En los ejercicios 11 a 14, hallar el límite y analizar la continuidadde la función (si existe).En los ejercicios 15 a 24, hallar todas las primeras derivadas parciales.25. Para pensar Dibujar una gráfica de una funcióncuyas derivadas y sean siempre negativas.26. Hallar las pendientes de la superficie en lasdirecciones x y y en el punto .En los ejercicios 27 a 30, hallar todas las segundas derivadas parcialesy verificar que las segundas derivadas parciales mixtas soniguales.Ecuación de LaplaceEn los ejercicios 31 a 34, mostrar que lafunción satisface la ecuación de LaplaceEn los ejercicios 35 y 36, hallar la diferencial total.37. Análisis de errores Al medir los lados de un triángulo rectángulose obtienen los valores de 5 y 12 centímetros, con un posibleerror de centímetro. Aproximar el error máximo posible alcalcular la longitud de la hipotenusa. Aproximar el error porcentualmáximo.38. Análisis de errores Para determinar la altura de una torre, elángulo de elevación a la parte superior de la torre se midió desdeun punto a 100 piespie de la base. La medida del ángulo da33°, con un posible error de 1°. Suponer que el suelo es horizontal,para aproximar el error máximo al determinar la alturade la torre.39. Volumen Se mide un cono circular recto. Su radio y su alturason 2 y 5 pulgadas, respectivamente. El posible error demedición es – 1 8 de pulgada. Aproximar el error máximo posible enel cálculo del volumen.40. Superficie lateral Aproximar el error en el cálculo de la superficielateral del cono del ejercicio 39. (La superficie lateral estádada por A rr 2 h 2 .± 1 2122, 0, 0z x 2 ln y 1f yf xz f x, ygx, y y 1 x f x, y e x2 y 2 f x, y xx yf x, y x 2 y 2f x, y ln xyf x, y e x2 y 2978 CAPÍTULO 13 Funciones de varias variables1.2. c 0f x, y, z 4x 2 y 2 4z 2 ,c 2f x, y, z x 2 y z 2 ,f x, y 1 x 2 y 2 .11. 12.13. 14. límx, y → 0, 0x 2 yx 4 y 2límx, y → 0, 0yxe y21 x 2 límx, y → 1, 1xyx 2 y 2límx, y → 1, 1xyx 2 y 215. 16.17. 18. z ln x 2 y 2 1z e y e x f x, yxyxyf x, ye x cos yzx 2 +2 zy 2 0.gx, y cos x 2yh x, y x sen y y cos xhx, yxxyfx, y 3x 2 xy 2y 3 2, 0, 0y-x-z x 2 ln y 1f yf x z f x, yux, tc sen akx cos ktu x, tce n2 t sen nxf x, y, z11 x 2 y 2 z 2fx, y, zz arctan y xw x 2 y 2 z 2gx, yxyx 2 y 2z ln x 2 y 2 1z e y e x fx, yxyxyfx, ye x cos ylímx, y → 0, 0x 2 yx 4 y 2límx, y → 0, 0yxe y21 x 2 límx, y → 1, 1xyx 2 y 2límx, y → 1, 1xyx 2 y 2 gx, y y 1 xfx, y e x2 y 2 fx, yxxyfx, y x 2 y 2 fx, y ln xyf x, y e x2 y 2z f x, 0 .zf 0, ygx, y 4 fx, y .fgx, y f x 2, y .ff.fx, y 1 x 2 y 2 .z f x, 1 .zf 1, ygx, y f x, y 2.fgx, y f x, y 2.ff.f x, y x 2 y 2 .c 0f x, y, z 4x 2 y 2 4z 2 ,c 2f x, y, z x 2 y z 2 ,c.f x, y, zcCASCASIn Exercises 1 and 2, sketch the graph of the level surfaceat the given value of1.2.3. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofand4. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofandIn Exercises 5–8, use a computer algebra system to graphseveral level curves of the function.5. 6.7. 8.In Exercises 9 and 10, use a computer algebra system to graphthe function.9. 10.In Exercises 11–14, find the limit and discuss the continuity ofthe function (if it exists).11. 12.13. 14.In Exercises 15–24, find all first partial derivatives.15. 16.17. 18.19. 20.21.22.23. 24.25. Think About It Sketch a graph of a functionwhose derivative is always negative and whose derivative isalways negative.26. Find the slopes of the surface in the anddirections at the point .In Exercises 27–30, find all second partial derivatives andverify that the second mixed partials are equal.27. 28.29. 30.Laplace’s EquationIn Exercises 31–34, show that the functionsatisfies Laplace’s equation31. 32.33. 34.In Exercises 35 and 36, find the total differential.35. 36.37. Error Analysis The legs of a right triangle are measured to be5 centimeters and 12 centimeters, with a possible error ofcentimeter. Approximate the maximum possible error incomputing the length of the hypotenuse. Approximate themaximum percent error.38. Error Analysis To determine the height of a tower, the angleof elevation to the top of the tower is measured from a point 100feet foot from the base. The angle is measured at witha possible error ofAssuming that the ground ishorizontal, approximate the maximum error in determining theheight of the tower.39. Volume A right circular cone is measured, and the radius andheight are found to be 2 inches and 5 inches, respectively. Thepossible error in measurement isinch. Approximate themaximum possible error in the computation of the volume.40. Lateral Surface Area Approximate the error in the computationof the lateral surface area of the cone in Exercise 39. Thelateral surface area is given by A r r 2 h 2 .181.33 ,± 1 212zxyx 2 y 2zx sen xyze y sen xzyx 2 y 2 z x 3 3xy 2z x 2 y 22 zx 2 +2 zy 2 0.gx, y cos x 2yh x, y x sen y y cos xhx, yxxyfx, y 3x 2 xy 2y 3 2, 0, 0y-x-z x 2 ln y 1f yf x z f x, yux, tc sen akx cos ktu x, tce n2 t sen nxfx, y, z11 x 2 y 2 z 2fx, y, zz arctan y xw x 2 y 2 z 2gx, yxyx 2 y 2z ln x 2 y 2 1z e y e x fx, yxyxyfx, ye x cos ylímx, y → 0, 0x 2 yx 4 y 2límx, y → 0, 0yxe y21 x 2 límx, y → 1, 1xyx 2 y 2límx, y → 1, 1xyx 2 y 2 gx, y y 1 xfx, y e x2 y 2 fx, yxxyfx, y x 2 y 2 fx, y ln xyf x, y e x2 y 2z f x, 0 .zf 0, ygx, y 4 fx, y .fgx, y f x 2, y .ff.fx, y 1 x 2 y 2 .z f x, 1 .zf 1, ygx, y f x, y 2.fgx, y f x, y 2.ff.fx, y x 2 y 2 .c 0f x, y, z 4x 2 y 2 4z 2 ,c 2f x, y, z x 2 y z 2 ,c.f x, y, zc978 Chapter 13 Functions of Several Variables13 REVIEW EXERCISES See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASCASIn Exercises 1 and 2, sketch the graph of the level surfaceat the given value of1.2.3. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofand4. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofandIn Exercises 5–8, use a computer algebra system to graphseveral level curves of the function.5. 6.7. 8.In Exercises 9 and 10, use a computer algebra system to graphthe function.9. 10.In Exercises 11–14, find the limit and discuss the continuity ofthe function (if it exists).11. 12.13. 14.In Exercises 15–24, find all first partial derivatives.15. 16.17. 18.19. 20.21.22.23. 24.25. Think About It Sketch a graph of a functionwhose derivative is always negative and whose derivative isalways negative.26. Find the slopes of the surface in the anddirections at the point .In Exercises 27–30, find all second partial derivatives andverify that the second mixed partials are equal.27. 28.29. 30.Laplace’s EquationIn Exercises 31–34, show that the functionsatisfies Laplace’s equation31. 32.33. 34.In Exercises 35 and 36, find the total differential.35. 36.37. Error Analysis The legs of a right triangle are measured to be5 centimeters and 12 centimeters, with a possible error ofcentimeter. Approximate the maximum possible error incomputing the length of the hypotenuse. Approximate themaximum percent error.38. Error Analysis To determine the height of a tower, the angleof elevation to the top of the tower is measured from a point 100feet foot from the base. The angle is measured at witha possible error ofAssuming that the ground ishorizontal, approximate the maximum error in determining theheight of the tower.39. Volume A right circular cone is measured, and the radius andheight are found to be 2 inches and 5 inches, respectively. Thepossible error in measurement isinch. Approximate themaximum possible error in the computation of the volume.40. Lateral Surface Area Approximate the error in the computationof the lateral surface area of the cone in Exercise 39. Thelateral surface area is given by A r r 2 h 2 .181.33 ,± 1 212zxyx 2 y 2zx sen xyze y sen xzyx 2 y 2 z x 3 3xy 2z x 2 y 22 zx 2 +2 zy 2 0.gx, y cos x 2yh x, y x sen y y cos xhx, yxxyfx, y 3x 2 xy 2y 3 2, 0, 0y-x-z x 2 ln y 1f yf x z f x, yu x, tc sen akx cos ktu x, tce n2 t sen nxf x, y, z11 x 2 y 2 z 2f x, y, zz arctan y xw x 2 y 2 z 2g x, yxyx 2 y 2z ln x 2 y 2 1z e y e x fx, yxyxyfx, ye x cos ylímx, y → 0, 0x 2 yx 4 y 2límx, y → 0, 0yxe y21 x 2 límx, y → 1, 1xyx 2 y 2límx, y → 1, 1xyx 2 y 2 gx, y y 1 xfx, y e x2 y 2 fx, yxxyfx, y x 2 y 2 fx, y ln xyf x, y e x2 y 2z f x, 0 .zf 0, ygx, y 4 fx, y .fgx, y f x 2, y .ff.fx, y 1 x 2 y 2 .z f x, 1 .zf 1, ygx, y f x, y 2.fgx, y f x, y 2.ff.fx, y x 2 y 2 .c 0f x, y, z 4x 2 y 2 4z 2 ,c 2f x, y, z x 2 y z 2 ,c.f x, y, zc978 Chapter 13 Functions of Several Variables13 REVIEW EXERCISES See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASCASIn Exercises 1 and 2, sketch the graph of the level surfaceat the given value of1.2.3. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofand4. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofandIn Exercises 5–8, use a computer algebra system to graphseveral level curves of the function.5. 6.7. 8.In Exercises 9 and 10, use a computer algebra system to graphthe function.9. 10.In Exercises 11–14, find the limit and discuss the continuity ofthe function (if it exists).11. 12.13. 14.In Exercises 15–24, find all first partial derivatives.15. 16.17. 18.19. 20.21.22.23. 24.25. Think About It Sketch a graph of a functionwhose derivative is always negative and whose derivative isalways negative.26. Find the slopes of the surface in the anddirections at the point .In Exercises 27–30, find all second partial derivatives andverify that the second mixed partials are equal.27. 28.29. 30.Laplace’s EquationIn Exercises 31–34, show that the functionsatisfies Laplace’s equation31. 32.33. 34.In Exercises 35 and 36, find the total differential.35. 36.37. Error Analysis The legs of a right triangle are measured to be5 centimeters and 12 centimeters, with a possible error ofcentimeter. Approximate the maximum possible error incomputing the length of the hypotenuse. Approximate themaximum percent error.38. Error Analysis To determine the height of a tower, the angleof elevation to the top of the tower is measured from a point 100feet foot from the base. The angle is measured at witha possible error ofAssuming that the ground ishorizontal, approximate the maximum error in determining theheight of the tower.39. Volume A right circular cone is measured, and the radius andheight are found to be 2 inches and 5 inches, respectively. Thepossible error in measurement isinch. Approximate themaximum possible error in the computation of the volume.40. Lateral Surface Area Approximate the error in the computationof the lateral surface area of the cone in Exercise 39. Thelateral surface area is given by A r r 2 h 2 .181.33 ,± 1 212zxyx 2 y 2zx sen xyze y sen xzyx 2 y 2 z x 3 3xy 2z x 2 y 22 zx 2 +2 zy 2 0.g x, y cos x 2yh x, y x sen y y cos xh x, yxxyf x, y 3x 2 xy 2y 3 2, 0, 0y-x-z x 2 ln y 1f yf x z f x, yux, tc sen akx cos ktu x, tce n2 t sen nxfx, y, z11 x 2 y 2 z 2fx, y, zz arctan y xw x 2 y 2 z 2g x, yxyx 2 y 2z ln x 2 y 2 1z e y e x fx, yxyxyfx, ye x cos ylímx, y → 0, 0x 2 yx 4 y 2límx, y → 0, 0yxe y21 x 2 límx, y → 1, 1xyx 2 y 2límx, y → 1, 1xyx 2 y 2 gx, y y 1 xfx, y e x2 y 2 fx, yxxyfx, y x 2 y 2 fx, y ln xyf x, y e x2 y 2z f x, 0 .zf 0, ygx, y 4 fx, y .fgx, y f x 2, y .ff.fx, y 1 x 2 y 2 .z f x, 1 .zf 1, ygx, y f x, y 2.fgx, y f x, y 2.ff.fx, y x 2 y 2 .c 0f x, y, z 4x 2 y 2 4z 2 ,c 2f x, y, z x 2 y z 2 ,c.f x, y, zc978 Chapter 13 Functions of Several Variables13 REVIEW EXERCISES See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASCASIn Exercises 1 and 2, sketch the graph of the level surfaceat the given value of1.2.3. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofand4. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofandIn Exercises 5–8, use a computer algebra system to graphseveral level curves of the function.5. 6.7. 8.In Exercises 9 and 10, use a computer algebra system to graphthe function.9. 10.In Exercises 11–14, find the limit and discuss the continuity ofthe function (if it exists).11. 12.13. 14.In Exercises 15–24, find all first partial derivatives.15. 16.17. 18.19. 20.21.22.23. 24.25. Think About It Sketch a graph of a functionwhose derivative is always negative and whose derivative isalways negative.26. Find the slopes of the surface in the anddirections at the point .In Exercises 27–30, find all second partial derivatives andverify that the second mixed partials are equal.27. 28.29. 30.Laplace’s EquationIn Exercises 31–34, show that the functionsatisfies Laplace’s equation31. 32.33. 34.In Exercises 35 and 36, find the total differential.35. 36.37. Error Analysis The legs of a right triangle are measured to be5 centimeters and 12 centimeters, with a possible error ofcentimeter. Approximate the maximum possible error incomputing the length of the hypotenuse. Approximate themaximum percent error.38. Error Analysis To determine the height of a tower, the angleof elevation to the top of the tower is measured from a point 100feet foot from the base. The angle is measured at witha possible error ofAssuming that the ground ishorizontal, approximate the maximum error in determining theheight of the tower.39. Volume A right circular cone is measured, and the radius andheight are found to be 2 inches and 5 inches, respectively. Thepossible error in measurement isinch. Approximate themaximum possible error in the computation of the volume.40. Lateral Surface Area Approximate the error in the computationof the lateral surface area of the cone in Exercise 39. Thelateral surface area is given by A r r 2 h 2 .181.33 ,± 1 212zxyx 2 y 2zx sen xyze y sen xzyx 2 y 2 z x 3 3xy 2z x 2 y 22 zx 2 +2 zy 2 0.gx, y cos x 2yh x, y x sen y y cos xhx, yxxyfx, y 3x 2 xy 2y 3 2, 0, 0y-x-z x 2 ln y 1f yf x z f x, yux, tc sen akx cos ktu x, tce n2 t sen nxf x, y, z11 x 2 y 2 z 2fx, y, zz arctan y xw x 2 y 2 z 2gx, yxyx 2 y 2z ln x 2 y 2 1z e y e x fx, yxyxyfx, ye x cos ylímx, y → 0, 0x 2 yx 4 y 2límx, y → 0, 0yxe y21 x 2 límx, y → 1, 1xyx 2 y 2límx, y → 1, 1xyx 2 y 2 gx, y y 1 xfx, y e x2 y 2 fx, yxxyfx, y x 2 y 2 fx, y ln xyf x, y e x2 y 2z f x, 0 .zf 0, ygx, y 4 fx, y .fgx, y f x 2, y .ff.fx, y 1 x 2 y 2 .z f x, 1 .zf 1, ygx, y f x, y 2.fgx, y f x, y 2.ff.f x, y x 2 y 2 .c 0f x, y, z 4x 2 y 2 4z 2 ,c 2f x, y, z x 2 y z 2 ,c.f x, y, zc978 Chapter 13 Functions of Several Variables13 REVIEW EXERCISES See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASCASIn Exercises 1 and 2, sketch the graph of the level surfaceat the given value of1.2.3. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofand4. Conjecture Consider the function(a) Sketch the graph of the surface given by(b) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(c) Make a conjecture about the relationship between thegraphs of and Explain yourreasoning.(d) On the surface in part (a), sketch the graphs ofandIn Exercises 5–8, use a computer algebra system to graphseveral level curves of the function.5. 6.7. 8.In Exercises 9 and 10, use a computer algebra system to graphthe function.9. 10.In Exercises 11–14, find the limit and discuss the continuity ofthe function (if it exists).11. 12.13. 14.In Exercises 15–24, find all first partial derivatives.15. 16.17. 18.19. 20.21.22.23. 24.25. Think About It Sketch a graph of a functionwhose derivative is always negative and whose derivative isalways negative.26. Find the slopes of the surface in the anddirections at the point .In Exercises 27–30, find all second partial derivatives andverify that the second mixed partials are equal.27. 28.29. 30.Laplace’s EquationIn Exercises 31–34, show that the functionsatisfies Laplace’s equation31. 32.33. 34.In Exercises 35 and 36, find the total differential.35. 36.37. Error Analysis The legs of a right triangle are measured to be5 centimeters and 12 centimeters, with a possible error ofcentimeter. Approximate the maximum possible error incomputing the length of the hypotenuse. Approximate themaximum percent error.38. Error Analysis To determine the height of a tower, the angleof elevation to the top of the tower is measured from a point 100feet foot from the base. The angle is measured at witha possible error ofAssuming that the ground ishorizontal, approximate the maximum error in determining theheight of the tower.39. Volume A right circular cone is measured, and the radius andheight are found to be 2 inches and 5 inches, respectively. Thepossible error in measurement isinch. Approximate themaximum possible error in the computation of the volume.40. Lateral Surface Area Approximate the error in the computationof the lateral surface area of the cone in Exercise 39. Thelateral surface area is given by A r r 2 h 2 .181.33 ,± 1 212zxyx 2 y 2zx sen xyze y sen xzyx 2 y 2 z x 3 3xy 2z x 2 y 22 zx 2 +2 zy 2 0.gx, y cos x 2yh x, y x sen y y cos xhx, yxxyfx, y 3x 2 xy 2y 3 2, 0, 0y-x-z x 2 ln y 1f yf x z f x, yux, tc sen akx cos ktu x, tce n2 t sen nxfx, y, z11 x 2 y 2 z 2fx, y, zz arctan y xw x 2 y 2 z 2gx, yxyx 2 y 2z ln x 2 y 2 1z e y e x fx, yxyxyfx, ye x cos ylímx, y → 0, 0x 2 yx 4 y 2límx, y → 0, 0yxe y21 x 2 límx, y → 1, 1xyx 2 y 2límx, y → 1, 1xyx 2 y 2 gx, y y 1 xfx, y e x2 y 2 fx, yxxyfx, y x 2 y 2 fx, y ln xyf x, y e x2 y 2z f x, 0 .zf 0, ygx, y 4 fx, y .fgx, y f x 2, y .ff.fx, y 1 x 2 y 2 .z f x, 1 .zf 1, ygx, y f x, y 2.fgx, y f x, y 2.ff.fx, y x 2 y 2 .c 0f x, y, z 4x 2 y 2 4z 2 ,c 2f x, y, z x 2 y z 2 ,c.f x, y, zc978 Chapter 13 Functions of Several Variables13 REVIEW EXERCISES See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASCAS
Ejercicios de repaso 979En los ejercicios 41 a 44, hallar las derivadas indicadas a) utilizandola regla de la cadena apropiada y b) por sustitución antesde derivar.En los ejercicios 45 y 46, derivar implícitamente para encontrarlas primeras derivadas parciales de z.En los ejercicios 47 a 50, hallar la derivada direccional de la funciónen P en la dirección de v.En los ejercicios 51 a 54, hallar el gradiente de la función y elvalor máximo de la derivada direccional en el punto dado.En los ejercicios 55 y 56, a) encontrar el gradiente de la funciónen P, b) encontrar un vector normal a la curva de nivel f(x, y) = c enP, c) encontrar la recta tangente a la curva de nivel f(x, y) = cen P, y d) trazar la curva de nivel, el vector unitario normal y larecta tangente en el plano xy.En los ejercicios 57 a 60, hallar una ecuación del plano tangentey las ecuaciones paramétricas de la recta normal a la superficieen el punto dado.SuperficiePunto57.58.59.60.En los ejercicios 61 y 62, hallar las ecuaciones simétricas de larecta tangente a la curva de intersección de las superficies en elpunto dado.63. Hallar el ángulo de inclinación del plano tangente a la superficieen el punto64. Aproximación Considerar las aproximaciones siguientes auna funcióncentrada enAproximación linealAproximación cuadrática[Observar que la aproximación lineal es el plano tangente a lasuperficie ena) Hallar la aproximación lineal de centradaenb) Hallar la aproximación cuadrática decentrada enc) Si en la aproximación cuadrática, ¿para qué función seobtiene el polinomio de Taylor de segundo grado?d) Completar la tabla.e) Utilizar un sistema algebraico por computadora para representargráficamente las superficiesy¿Cómo varía la exactitud de las aproximacionesa medida que aumenta la distancia para (0, 0)?En los ejercicios 65 a 68, localizar los extremos relativos de lafunción. Utilizar un sistema algebraico por computadora y representargráficamente la función y confirmar los resultados.z P 2 x, y.z P 1 x, y,z f x, y,y 00, 0.f x, y cos x sin y0, 0.f x, y cos x sin y0, 0, f 0, 0.12 f xx0, 0x 2 f xy 0, 0xy 1 2 f yy0, 0y 2P 2 x, y f 0, 0 f x 0, 0x f y 0, 0y P 1 x, y f 0, 0 f x 0, 0x f y 0, 0y0, 0.f x, y2, 1, 3.x 2 y 2 z 2 141, 2, 2z 9 x 2 y 22, 3, 4z 9 4x 6y x 2 y 22, 3, 4f x, y 25 y 22, 1, 4f x, y x 2 ysenIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2f x, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y f x, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASsenIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150fx, yxy1x1yfx, y x 2 3xy y 2 5xfx, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCASIn Exercises 41– 44, find the indicated derivatives (a) usingthe appropriate Chain Rule and (b) using substitution beforedifferentiating.41.42.43.44.In Exercises 45 and 46, differentiate implicitly to find the firstpartial derivatives of45. 46.In Exercises 47–50, find the directional derivative of the functionat in the direction of v.47.48.49.50.In Exercises 51–54, find the gradient of the function and themaximum value of the directional derivative at the given point.51. 52.53. 54.In Exercises 55 and 56, (a) find the gradient of the function at(b) find a unit normal vector to the level curveat(c) find the tangent line to the level curve at and(d) sketch the level curve, the unit normal vector, and thetangent line in theplane.55. 56.In Exercises 57–60, find an equation of the tangent plane andparametric equations of the normal line to the surface at thegiven point.57.58.59.60.In Exercises 61 and 62, find symmetric equations of the tangentline to the curve of intersection of the surfaces at the givenpoint.61.62.63. Find the angle of inclination of the tangent plane to thesurfaceat the point64. Approximation Consider the following approximations for afunctioncentered at[Note that the linear approximation is the tangent plane to thesurface at(a) Find the linear approximation ofcentered at(b) Find the quadratic approximation ofcentered at(c) Ifin the quadratic approximation, you obtain thesecond-degree Taylor polynomial for what function?(d) Complete the table.(e) Use a computer algebra system to graph the surfacesandHow does theaccuracy of the approximations change as the distance fromincreases?In Exercises 65–68, examine the function for relative extremaand saddle points. Use a computer algebra system to graph thefunction and confirm your results.65.66.67.68.0.05y 3 20.6y 125z 50 x y 0.1x 3 20x 150f x, yxy1x1yf x, y x 2 3xy y 2 5xf x, y 2x 2 6xy 9y 2 8x 140, 0z P 2 x, y .z P 1 x, y ,z fx, y ,y 00, 0 .fx, y cos x sen y0, 0 .fx, y cos x sen y0, 0, f 0, 0 .12 f xx 0, 0 x 2 f xy 0, 0 xy12 f yy 0, 0 y 2P 2 x, y f 0, 0 f x 0, 0 x f y 0, 0 yQuadratic approximation:P 1 x, y f 0, 0 f x 0, 0 x f y 0, 0 yLinear approximation:0, 0 .f x, y2, 1, 3 .x 2 y 2 z 2 142, 1, 3z x 2 y 2 , z 32, 2, 5z 9 y 2 , y xPuntoSuperficies1, 2, 2z 9 x 2 y 2 2, 3, 4z 9 4x 6y x 2 y 2 2, 3, 4f x, y 25 y 2 2, 1, 4f x, yx 2 yPointSurfacec 3, P 2 , 1c 65, P 3, 2fx, y 4y sen x yf x, y 9x 2 4y 2xy-P,f x, ycP,f x, ycP,zx 2x y , 2, 1zyx 2 y 2 , 1, 1 z e x cos y, 0, 4z x 2 y, 2, 1v i j k1, 0, 1 ,w 5x 2 2xy 3y 2 z,v 2i j 2k1, 2, 2 ,w y 2 xz,v 2i j1, 4 ,f x, y14 y 2 x 2 ,v 3i 4j5, 5 ,f x, y x 2 y,Pxz 2 y sen z 0x 2 xy y 2 yz z 2 0z.zty r sen t,x r cos t,ur ,utu x 2 y 2 z 2 ,z 2r tyrt,x 2r t,wr ,wtwxyz , y sen tx cos t,dudtu y 2 x,y 4 tx 2t,dwdtw ln x 2 y ,Review Exercises 979x y fx, y P 1 x, y P 2 x, y0 00 0.10.2 0.10.5 0.31 0.5SACCAS
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1092 1092 Chapter CAPÍTULO 15 Vect
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1110 Chapter 15 Vector Analysis1110
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15 Ejercicios de repaso1138 CAPÍTU
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1142 1142 Chapter CAPÍTULO15 15 15
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A Demostración de teoremas selecci
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B Tablas de integraciónFórmulasu
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A-6 ApénDiCE B Tablas de integraci
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A-8 ApénDiCE B Tablas de integraci
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A-10 Soluciones de los ejercicios i
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A-40 Soluciones de los ejercicios i
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Answers to Odd-Numbered ExercisesA-
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A-44 Soluciones de los ejercicios i
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A-50 Soluciones de los ejercicios i
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A-52 Soluciones de los ejercicios i
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A-54 Soluciones de los ejercicios i
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Índice analíticoAAceleración, 85
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ÍNDICE ANALÍtICo I-59Máximo rela