916 CAPÍTULO 13 Funciones de varias variables117. Ingreso marginal Una corporación farmacéutica tiene dosplantas que producen la misma medicina. Si x 1 y x 2 son losnúmeros de unidades producidos en la planta 1 y en la planta 2,respectivamente, entonces el ingreso total del producto estádado porCuandox 1 = 4 y x 2 = 12, encontrar a) el ingreso marginal para la planta1, y b) el ingreso marginal para la planta 2,118. Costo marginal Una empresa fabrica dos tipos de estufas decombustión de madera: el modelo autoestable y el modelo parainserción en una chimenea. La función de costo para producirx estufas autoestables y y de inserción en una chimenea esa) Calcular los costos marginales y cuandoyb) Cuando se requiera producción adicional, ¿qué modelo deestufa hará incrementar el costo con una tasa más alta? ¿Cómopuede determinarse esto a partir del modelo del costo?119. Psicología Recientemente en el siglo xx se desarrolló una pruebade inteligencia llamada la Prueba de Stanford-Binet (másconocida como la prueba IQ). En esta prueba, una edad mentalindividual M es dividida entre la edad cronológica individual C,y el cociente es multiplicado por 100. El resultado es el IQ individual.Encontrar las derivadas parciales de IQ con respecto a M y conrespecto a C. Evaluar las derivadas parciales en el punto (12, 10)e interpretar el resultado. (Fuente: Adaptado de Bernstein/Clark-Steward/Roy/Wickens, Psicología, 4a. ed.)120. Productividad marginal Considerar la función de producciónde Cobb-Douglas Si x 1 000 y y 500,hallar a) la productividad marginal del trabajo,y b) laproductividad marginal del capital,121. Para pensar Sea el número de aspirantes a una universidad,p el costo por alimentación y alojamiento en la universidad,y t el costo de la matrícula. N es una función de p y t talque y ¿Qué información se obtiene alsaber que ambas derivadas parciales son negativas?122. Inversión El valor de una inversión de $1 000 al 6% deinterés compuesto anual esdonde I es la tasa anual de inflación y R es la tasa de impuestopara el inversor. CalcularyDeterminar si la tasa de impuesto o la tasa de inflación es elmayor factor “negativo” sobre el crecimiento de la inversión.123. Distribución de temperatura La temperatura en cualquierpuntode una placa de acero esdonde y son medidos en metros. En el punto (2, 3), hallar elritmo de cambio de la temperatura respecto a la distancia recorridaen la placa en las direcciones del eje x y y.124. Temperatura aparente Una medida de la percepción delcalor ambiental por unas personas promedio es el Índice detemperatura aparente. Un modelo para este índice esdonde es la temperatura aparente en grados Celsius, es latemperatura del aire yes la humedad relativa dada en formadecimal. (Fuente: The UMAP Journal)a) Hallar y si yb) ¿Qué influye más sobre A, la temperatura del aire o lahumedad? Explicar.125. Ley de los gases ideales La ley de los gases ideales estableceque donde es la presión, es el volumen, es elnúmero de moles de gas,es una constante (la constante de losgases) y T es temperatura absoluta. Mostrar que126. Utilidad marginal La función de utilidad es unamedida de la utilidad (o satisfacción) que obtiene una personapor el consumo de dos productos ySuponer que la funciónde utilidad esa) Determinar la utilidad marginal del productob) Determinar la utilidad marginal del productoc) Si y ¿se debe consumir una unidad más deproducto x o una unidad más de producto y? Explicar elrazonamiento.d) Utilizar un sistema algebraico por computadora y representargráficamente la función. Interpretar las utilidades marginalesde productos x y y con una gráfica.127. Modelo matemático En la tabla se muestran los consumosper cápita (en galones) de diferentes tipos de leche en EstadosUnidos desde 1999 hasta 2005. El consumo de leche light ydescremada, leche baja en grasa y leche entera se representapor las variables x, y y z, respectivamente. (Fuente: U.S. Departmentof Agriculture)Un modelo para los datos está dado pora) Hallar yb) Interpretar las derivadas parciales en el contexto del problema.zy .zxy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xU fx, yTPPVVT 1.RnVPPV nRT,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544yxT 500 0.6x 2 1.5y 2 ,x, yV R 0.03, 0.28.V I 0.03, 0.28Nt < 0.Np < 0Nfy.916 Chapter 13 Functions of Several Variables117. Marginal Revenue A pharmaceutical corporation has twoplants that produce the same over-the-counter medicine. Ifand are the numbers of units produced at plant 1 and plant 2,respectively, then the total revenue for the product is given byWhenand find (a) the marginal revenue for plant 1,and (b) the marginal revenue for plant 2,118. Marginal Costs A company manufactures two types ofwood-burning stoves: a freestanding model and a fireplaceinsertmodel. The cost function for producingfreestandingand fireplace-insert stoves is(a) Find the marginal costs and whenand(b) When additional production is required, which model ofstove results in the cost increasing at a higher rate? Howcan this be determined from the cost model?119. Psychology Early in the twentieth century, an intelligence testcalled the Stanford-Binet Test (more commonly known as the IQtest) was developed. In this test, an individual’s mental ageisdivided by the individual’s chronological ageand the quotientis multiplied by 100. The result is the individual’sFind the partial derivatives of with respect to and withrespect toEvaluate the partial derivatives at the pointand interpret the result.(Source: Adapted fromBernstein/Clark-Stewart/Roy/Wickens, Psychology, FourthEdition)120. Marginal Productivity Consider the Cobb-Douglas productionfunction When andfind (a) the marginal productivity of labor,and (b) the marginal productivity of capital,121. Think About It Let be the number of applicants to auniversity,the charge for food and housing at the university,and the tuition. is a function of and such thatandWhat information is gained bynoticing that both partials are negative?122. Investment The value of an investment of $1000 earning 6%compounded annually iswhere is the annual rate of inflation andis the tax rate forthe person making the investment. CalculateandDetermine whether the tax rate or the rateof inflation is the greater “negative” factor in the growth of theinvestment.123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, yV R 0.03, 0.28 .V I 0.03, 0.28RIVI, R 1 000 1 0.06 1 R1 I10N t < 0.N p < 0tpNtpNf y.f x,y 500,x 1000f x, y 200x 0.7 y 0.3 .12, 10C.MIQIQ M, CMC100IQ.CMy 20.x 80CyCxC 32 xy 175x 205y 1 050.yxR x 2 .R x 1 ,x 2 12,x 1 4R 200x 1 200x 2 4x 1 2 8x 1 x 2 4x 22 .x 2 x 1116. Find the four second partial derivatives of the functiongiven byShow that the secondmixed partial derivatives and are equal.f yxf xyfx, y sen x 2y .CAPSTONEAño 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CASfx, y 200x 0.7 y 0.3 .y 20.x 80CyCxC 32xy 175x 205y 1050.916 Chapter 13 Functions of Several Variables117. Marginal Revenue A pharmaceutical corporation has twoplants that produce the same over-the-counter medicine. Ifand are the numbers of units produced at plant 1 and plant 2,respectively, then the total revenue for the product is given byWhenand find (a) the marginal revenue for plant 1,and (b) the marginal revenue for plant 2,118. Marginal Costs A company manufactures two types ofwood-burning stoves: a freestanding model and a fireplaceinsertmodel. The cost function for producingfreestandingand fireplace-insert stoves is(a) Find the marginal costs and whenand(b) When additional production is required, which model ofstove results in the cost increasing at a higher rate? Howcan this be determined from the cost model?119. Psychology Early in the twentieth century, an intelligence testcalled the Stanford-Binet Test (more commonly known as the IQtest) was developed. In this test, an individual’s mental ageisdivided by the individual’s chronological ageand the quotientis multiplied by 100. The result is the individual’sFind the partial derivatives of with respect to and withrespect toEvaluate the partial derivatives at the pointand interpret the result.(Source: Adapted fromBernstein/Clark-Stewart/Roy/Wickens, Psychology, FourthEdition)120. Marginal Productivity Consider the Cobb-Douglas productionfunction When andfind (a) the marginal productivity of labor,and (b) the marginal productivity of capital,121. Think About It Let be the number of applicants to auniversity,the charge for food and housing at the university,and the tuition. is a function of and such thatandWhat information is gained bynoticing that both partials are negative?122. Investment The value of an investment of $1000 earning 6%compounded annually iswhere is the annual rate of inflation andis the tax rate forthe person making the investment. CalculateandDetermine whether the tax rate or the rateof inflation is the greater “negative” factor in the growth of theinvestment.123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, yV R 0.03, 0.28 .V I 0.03, 0.28RIVI, R 1 000 1 0.06 1 R1 I10N t < 0.N p < 0tpNtpNf y.f x,y 500,x 1000f x, y 200x 0.7 y 0.3 .12, 10C.MIQIQ M, CMC100IQ.CMy 20.x 80CyCxC 32 xy 175x 205y 1 050.yxR x 2 .R x 1 ,x 2 12,x 1 4R 200x 1 200x 2 4x 1 2 8x 1 x 2 4x 22 .x 2 x 1116. Find the four second partial derivatives of the functiongiven byShow that the secondmixed partial derivatives and are equal.f yxf xyf x, y sen x 2y .CAPSTONEAño 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CASns of Several Variablesaceutical corporation has twoover-the-counter medicine. Ifproduced at plant 1 and plant 2,enue for the product is given byWheninal revenue for plant 1,for plant 2,y manufactures two types oftanding model and a fireplaceonfor producingfreestandingsandwhenon is required, which model ofncreasing at a higher rate? Howm the cost model?tieth century, an intelligence testmore commonly known as the IQt, an individual’s mental age isnological ageand the quotientlt is the individual’swith respect toand withpartial derivatives at the pointesult.(Source: Adapted from/Wickens, Psychology, Fourthsider the Cobb-Douglas produc-Whenandal productivity of labor,vity of capital,the number of applicants to aod and housing at the university,unction of and such thatWhat information is gained bynegative?investment of $1000 earning 6%nflation andis the tax rate fortment. Calculatewhether the tax rate or the rateative” factor in the growth of the123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, yV I 0.03, 0.28RR 10 tpf y.f x,x 1000x 0.7 y 0.3 .MIQIQ.CMx 80CyCx1 050.xR x 2 .R x 1 ,x 1 48x 1 x 2 4x 22 .x 1al derivatives of the functionShow that the secondandare equal.f yx2y .Año 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CAS916 Chapter 13 Functions of Several Variables117. Marginal Revenue A pharmaceutical corporation has twoplants that produce the same over-the-counter medicine. Ifand are the numbers of units produced at plant 1 and plant 2,respectively, then the total revenue for the product is given byWhenand find (a) the marginal revenue for plant 1,and (b) the marginal revenue for plant 2,118. Marginal Costs A company manufactures two types ofwood-burning stoves: a freestanding model and a fireplaceinsertmodel. The cost function for producingfreestandingand fireplace-insert stoves is(a) Find the marginal costs and whenand(b) When additional production is required, which model ofstove results in the cost increasing at a higher rate? Howcan this be determined from the cost model?119. Psychology Early in the twentieth century, an intelligence testcalled the Stanford-Binet Test (more commonly known as the IQtest) was developed. In this test, an individual’s mental ageisdivided by the individual’s chronological ageand the quotientis multiplied by 100. The result is the individual’sFind the partial derivatives of with respect to and withrespect toEvaluate the partial derivatives at the pointand interpret the result.(Source: Adapted fromBernstein/Clark-Stewart/Roy/Wickens, Psychology, FourthEdition)120. Marginal Productivity Consider the Cobb-Douglas productionfunction When andfind (a) the marginal productivity of labor,and (b) the marginal productivity of capital,121. Think About It Let be the number of applicants to auniversity,the charge for food and housing at the university,and the tuition. is a function of and such thatandWhat information is gained bynoticing that both partials are negative?122. Investment The value of an investment of $1000 earning 6%compounded annually iswhere is the annual rate of inflation andis the tax rate forthe person making the investment. CalculateandDetermine whether the tax rate or the rateof inflation is the greater “negative” factor in the growth of theinvestment.123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, yV R 0.03, 0.28 .V I 0.03, 0.28RIVI, R 1 000 1 0.06 1 R1 I10N t < 0.N p < 0tpNtpNf y.f x,y 500,x 1000f x, y 200x 0.7 y 0.3 .12, 10C.MIQIQ M, CMC100IQ.CMy 20.x 80CyCxC 32 xy 175x 205y 1 050.yxR x 2 .R x 1 ,x 2 12,x 1 4R 200x 1 200x 2 4x 1 2 8x 1 x 2 4x 22 .x 2 x 1116. Find the four second partial derivatives of the functiongiven byShow that the secondmixed partial derivatives and are equal.f yxf xyfx, y sen x 2y .CAPSTONEAño 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CASPara discusión116. Encontrar las cuatro segundas derivadas parciales de la funcióndada porMostrar que las segundasderivadas parciales mixtas f xy y f yx son iguales.916 Chapter 13 Functions of Several Variables117. Marginal Revenue A pharmaceutical corporation has twoplants that produce the same over-the-counter medicine. Ifand are the numbers of units produced at plant 1 and plant 2,respectively, then the total revenue for the product is given byWhenand find (a) the marginal revenue for plant 1,and (b) the marginal revenue for plant 2,118. Marginal Costs A company manufactures two types ofwood-burning stoves: a freestanding model and a fireplaceinsertmodel. The cost function for producingfreestandingand fireplace-insert stoves is(a) Find the marginal costs and whenand(b) When additional production is required, which model ofstove results in the cost increasing at a higher rate? Howcan this be determined from the cost model?119. Psychology Early in the twentieth century, an intelligence testcalled the Stanford-Binet Test (more commonly known as the IQtest) was developed. In this test, an individual’s mental ageisdivided by the individual’s chronological ageand the quotientis multiplied by 100. The result is the individual’sFind the partial derivatives of with respect to and withrespect toEvaluate the partial derivatives at the pointand interpret the result.(Source: Adapted fromBernstein/Clark-Stewart/Roy/Wickens, Psychology, FourthEdition)120. Marginal Productivity Consider the Cobb-Douglas productionfunction When andfind (a) the marginal productivity of labor,and (b) the marginal productivity of capital,121. Think About It Let be the number of applicants to auniversity,the charge for food and housing at the university,and the tuition. is a function of and such thatandWhat information is gained bynoticing that both partials are negative?122. Investment The value of an investment of $1000 earning 6%compounded annually iswhere is the annual rate of inflation andis the tax rate forthe person making the investment. CalculateandDetermine whether the tax rate or the rateof inflation is the greater “negative” factor in the growth of theinvestment.123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, yV R 0.03, 0.28 .V I 0.03, 0.28RIVI, R 1 000 1 0.06 1 R1 I10N t < 0.N p < 0tpNtpNf y.f x,y 500,x 1000f x, y 200x 0.7 y 0.3 .12, 10C.MIQIQ M, CMC100IQ.CMy 20.x 80CyCxC 32 xy 175x 205y 1 050.yxR x 2 .R x 1 ,x 2 12,x 1 4R 200x 1 200x 2 4x 1 2 8x 1 x 2 4x 22 .x 2 x 1116. Find the four second partial derivatives of the functiongiven byShow that the secondmixed partial derivatives and are equal.f yxf xyf x, y sen x 2y .CAPSTONEAño 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CAS916 Chapter 13 Functions of Several Variables117. Marginal Revenue A pharmaceutical corporation has twoplants that produce the same over-the-counter medicine. Ifand are the numbers of units produced at plant 1 and plant 2,respectively, then the total revenue for the product is given byWhenand find (a) the marginal revenue for plant 1,and (b) the marginal revenue for plant 2,118. Marginal Costs A company manufactures two types ofwood-burning stoves: a freestanding model and a fireplaceinsertmodel. The cost function for producingfreestandingand fireplace-insert stoves is(a) Find the marginal costs and whenand(b) When additional production is required, which model ofstove results in the cost increasing at a higher rate? Howcan this be determined from the cost model?119. Psychology Early in the twentieth century, an intelligence testcalled the Stanford-Binet Test (more commonly known as the IQtest) was developed. In this test, an individual’s mental ageisdivided by the individual’s chronological ageand the quotientis multiplied by 100. The result is the individual’sFind the partial derivatives of with respect to and withrespect toEvaluate the partial derivatives at the pointand interpret the result.(Source: Adapted fromBernstein/Clark-Stewart/Roy/Wickens, Psychology, FourthEdition)120. Marginal Productivity Consider the Cobb-Douglas productionfunction When andfind (a) the marginal productivity of labor,and (b) the marginal productivity of capital,121. Think About It Let be the number of applicants to auniversity,the charge for food and housing at the university,and the tuition. is a function of and such thatandWhat information is gained bynoticing that both partials are negative?122. Investment The value of an investment of $1000 earning 6%compounded annually iswhere is the annual rate of inflation andis the tax rate forthe person making the investment. CalculateandDetermine whether the tax rate or the rateof inflation is the greater “negative” factor in the growth of theinvestment.123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, yV R 0.03, 0.28 .V I 0.03, 0.28RIVI, R 1 000 1 0.06 1 R1 I10N t < 0.N p < 0tpNtpNf y.f x,y 500,x 1000f x, y 200x 0.7 y 0.3 .12, 10C.MIQIQ M, CMC100IQ.CMy 20.x 80CyCxC 32 xy 175x 205y 1 050.yxR x 2 .R x 1 ,x 2 12,x 1 4R 200x 1 200x 2 4x 1 2 8x 1 x 2 4x 22 .x 2 x 1116. Find the four second partial derivatives of the functiongiven byShow that the secondmixed partial derivatives and are equal.f yxf xyfx, y sen x 2y .CAPSTONEAño 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CAS916 Chapter 13 Functions of Several Variables117. Marginal Revenue A pharmaceutical corporation has twoplants that produce the same over-the-counter medicine. Ifand are the numbers of units produced at plant 1 and plant 2,respectively, then the total revenue for the product is given byWhenand find (a) the marginal revenue for plant 1,and (b) the marginal revenue for plant 2,118. Marginal Costs A company manufactures two types ofwood-burning stoves: a freestanding model and a fireplaceinsertmodel. The cost function for producingfreestandingand fireplace-insert stoves is(a) Find the marginal costs and whenand(b) When additional production is required, which model ofstove results in the cost increasing at a higher rate? Howcan this be determined from the cost model?119. Psychology Early in the twentieth century, an intelligence testcalled the Stanford-Binet Test (more commonly known as the IQtest) was developed. In this test, an individual’s mental ageisdivided by the individual’s chronological ageand the quotientis multiplied by 100. The result is the individual’sFind the partial derivatives of with respect to and withrespect toEvaluate the partial derivatives at the pointand interpret the result.(Source: Adapted fromBernstein/Clark-Stewart/Roy/Wickens, Psychology, FourthEdition)120. Marginal Productivity Consider the Cobb-Douglas productionfunction When andfind (a) the marginal productivity of labor,and (b) the marginal productivity of capital,121. Think About It Let be the number of applicants to auniversity,the charge for food and housing at the university,and the tuition. is a function of and such thatandWhat information is gained bynoticing that both partials are negative?122. Investment The value of an investment of $1000 earning 6%compounded annually iswhere is the annual rate of inflation andis the tax rate forthe person making the investment. CalculateandDetermine whether the tax rate or the rateof inflation is the greater “negative” factor in the growth of theinvestment.123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, yV R 0.03, 0.28 .V I 0.03, 0.28RIV I, R 1 000 1 0.06 1 R1 I10N t < 0.N p < 0tpNtpNf y.f x,y 500,x 1000f x, y 200x 0.7 y 0.3 .12, 10C.MIQIQ M, CMC100IQ.CMy 20.x 80CyCxC 32 xy 175x 205y 1 050.yxR x 2 .R x 1 ,x 2 12,x 1 4R 200x 1 200x 2 4x 1 2 8x 1 x 2 4x 22 .x 2 x 1116. Find the four second partial derivatives of the functiongiven byShow that the secondmixed partial derivatives and are equal.f yxf xyf x, y sen x 2y .CAPSTONEAño 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CAS63.64.In Exercises 65–70, evaluate and at the given point.65.66.67.68.69.70.In Exercises 71–80, find the four second partial derivatives.Observe that the second mixed partials are equal.71. 72.73. 74.75. 76.77. 78.79. 80.In Exercises 81–88, for find all values of and suchthat and simultaneously.81.82.83.84.85.86.87.88.In Exercises 89–92, use a computer algebra system to find thefirst and second partial derivatives of the function. Determinewhether there exist values of and such that andsimultaneously.89. 90.91. 92.Lapsati9799Wavsati101103Heasati105Infunreas107108In Eresp109110fx, yxyxyfx, ylnxx 2 y 2 fx, y 25 x 2 y 2fx, yx sec yf y x, y 0f x x, y 0yxfx, y ln x 2 y 2 1fx, y e x2 xy y 2fx, y 3x 3 12xy y 3fx, y1x1yxyfx, y x 2 xy y 2fx, y x 2 4xy y 2 4x 16y 3fx, y x 2 xy y 2 5x yfx, y x 2 xy y 2 2x 2yf y x, y 0f x x, y 0yxf x, y ,zarctan y xzcos xyz 2xe y 3ye xze x tan yz ln x yz x 2 y 2 z x 4 3x 2 y 2 y 4z x 2 2xy 3y 2 z x 2 3y 2z 3xy 2 1, 2, 1f x, y, z 3x 2 y 2 2z 2 ,0, 2 , 4f x, y, z z sen x y ,3, 1, 1f x, y, zxyx y z ,f x, y, zxyz , 1, 1, 1 2, 1, 2f x, y, z x 2 y 3 2xyz 3yz,f x, y, z x 3 yz 2 , 1, 1, 1f zf y ,f x ,G x, y, z11 x 2 y 2 z 2Fx, y, z ln x y zCAS1111111111W916 Chapter 13 Functions of Several Variables117. Marginal Revenue A pharmaceutical corporation has twoplants that produce the same over-the-counter medicine. Ifand are the numbers of units produced at plant 1 and plant 2,respectively, then the total revenue for the product is given byWhenand find (a) the marginal revenue for plant 1,and (b) the marginal revenue for plant 2,118. Marginal Costs A company manufactures two types ofwood-burning stoves: a freestanding model and a fireplaceinsertmodel. The cost function for producingfreestandingand fireplace-insert stoves is(a) Find the marginal costs and whenand(b) When additional production is required, which model ofstove results in the cost increasing at a higher rate? Howcan this be determined from the cost model?119. Psychology Early in the twentieth century, an intelligence testcalled the Stanford-Binet Test (more commonly known as the IQtest) was developed. In this test, an individual’s mental ageisdivided by the individual’s chronological ageand the quotientis multiplied by 100. The result is the individual’sFind the partial derivatives of with respect to and withrespect toEvaluate the partial derivatives at the pointand interpret the result.(Source: Adapted fromBernstein/Clark-Stewart/Roy/Wickens, Psychology, FourthEdition)120. Marginal Productivity Consider the Cobb-Douglas productionfunction When andfind (a) the marginal productivity of labor,and (b) the marginal productivity of capital,121. Think About It Let be the number of applicants to auniversity,the charge for food and housing at the university,and the tuition. is a function of and such thatandWhat information is gained bynoticing that both partials are negative?122. Investment The value of an investment of $1000 earning 6%compounded annually iswhere is the annual rate of inflation andis the tax rate forthe person making the investment. CalculateandDetermine whether the tax rate or the rateof inflation is the greater “negative” factor in the growth of theinvestment.123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, yV R 0.03, 0.28 .V I 0.03, 0.28RIVI, R 1 000 1 0.06 1 R1 I10N t < 0.N p < 0tpNtpNf y.f x,y 500,x 1000f x, y 200x 0.7 y 0.3 .12, 10C.MIQIQ M, CMC100IQ.CMy 20.x 80CyCxC 32 xy 175x 205y 1 050.yxR x 2 .R x 1 ,x 2 12,x 1 4R 200x 1 200x 2 4x 1 2 8x 1 x 2 4x 22 .x 2 x 1116. Find the four second partial derivatives of the functiongiven byShow that the secondmixed partial derivatives and are equal.f yxf xyf x, y sen x 2y .CAPSTONEAño 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CASter 13Functions of Several VariablesRevenueA pharmaceutical corporation has twoproduce the same over-the-counter medicine. Ifhe numbers of units produced at plant 1 and plant 2,y, then the total revenue for the product is given byWhenfind (a) the marginal revenue for plant 1,marginal revenue for plant 2,CostsA company manufactures two types ofing stoves: a freestanding model and a fireplaceel.The cost function for producingfreestandinglace-insert stoves ise marginal costs and whenadditional production is required, which model ofesults in the cost increasing at a higher rate? Hows be determined from the cost model?Early in the twentieth century, an intelligence testtanford-Binet Test (more commonly known as the IQveloped. In this test, an individual’s mental ageisthe individual’s chronological ageand the quotientd by 100. The result is the individual’sartial derivatives of with respect to and withEvaluate the partial derivatives at the pointnd interpret the result.(Source: Adapted fromClark-Stewart/Roy/Wickens, Psychology, FourthProductivityConsider the Cobb-Douglas productionWhen andind (a) the marginal productivity of labor,marginal productivity of capital,ut It Let be the number of applicants to athe charge for food and housing at the university,tuition. is a function of and such thatandWhat information is gained byat both partials are negative?t The value of an investment of $1000 earning 6%ed annually isthe annual rate of inflation andis the tax rate formaking the investment. CalculateDetermine whether the tax rate or the rateis the greater “negative” factor in the growth of the.123. Temperature Distribution The temperature at any pointin a steel plate iswhereand are measured in meters. At the pointfind the ratesof change of the temperature with respect to the distancesmoved along the plate in the directions of the and axes.124. Apparent Temperature A measure of how hot weather feelsto an average person is the Apparent Temperature Index. Amodel for this index iswhereis the apparent temperature in degrees Celsius, is theair temperature, andis the relative humidity in decimalform.(Source: The UMAP Journal)(a) Find and when and(b) Which has a greater effect onair temperature orhumidity? Explain.125. Ideal Gas Law The Ideal Gas Law states thatwhere is pressure, is volume, is the number of moles ofgas, is a fixed constant (the gas constant), and is absolutetemperature. Show that126. Marginal Utility The utility function is ameasure of the utility (or satisfaction) derived by a personfrom the consumption of two products and Suppose theutility function is(a) Determine the marginal utility of product(b) Determine the marginal utility of product(c) When and should a person consume onemore unit of productor one more unit of productExplain your reasoning.(d) Use a computer algebra system to graph the function.Interpret the marginal utilities of productsandgraphically.127. Modeling Data Per capita consumptions (in gallons) ofdifferent types of milk in the United States from 1999 through2005 are shown in the table. Consumption of flavored milk,plain reduced-fat milk, and plain light and skim milks arerepresented by the variables and respectively.(Source: U.S. Department of Agriculture)A model for the data is given by(a) Findand(b) Interpret the partial derivatives in the context of the problem.zy .zxz 0.92x 1.03y 0.02.z,y,x,yxy?xy 3,x 2y.x.U 5x 2 xy 3y 2 .y.xUf x, yTPPVVT1.TRnVPPVnRT,A,h 0.80.t 30AhAthtAA 0.885t 22.4h 1.20th 0.544y-x-2, 3 ,yxT 500 0.6x 2 1.5y 2 ,x, y3, 0.28 .V I 0.03, 0.28R000 1 0.06 1 R1 I10N t < 0.tpNpNf y.f x,x 1000f x, y 200x 0.7 y 0.3 .C.MIQMC100IQ.CM20.x 80CyCxy 175x 205y 1 050.xR x 2 .R x 1 ,2,x 1 4200x 2 4x 1 2 8x 1 x 2 4x 22 .x 1four second partial derivatives of the functionShow that the secondrtial derivatives and are equal.f yxf xyf x, y sen x 2y .Año 1999 2000 2001 2002 2003 2004 2005x 1.4 1.4 1.4 1.6 1.6 1.7 1.7y 7.3 7.1 7.0 7.0 6.9 6.9 6.9z 6.2 6.1 5.9 5.8 5.6 5.5 5.6CAS1 050.
SECCIÓN 13.3 Derivadas parciales 91713.3 Partial Derivatives 917128. Modelo matemático La tabla muestra el gasto en atención128.pública Modelingmédica Data(en milesThe tablede millones showsde thedólares) publicen compensaciónexpendituresmedicala trabajadores (in billionsx, asistencia of dollars)pública for worker’sy y seguro compensationmédico delEstado x,publicz, assistancedel año 2000 y,andal 2005. Medicare(Fuente: zfromCenters 2000 throughfor Medicare2005.and (Source:Medicaid CentersServices)for Medicare and Medicaid Services)Año 2000 2001 2002 2003 2004 2005x 24.9 28.1 30.1 31.4 32.1 33.5y 207.5 233.2 258.4 281.9 303.2 324.9z 224.3 247.7 265.7 283.5 312.8 342.0Un A modelo for para the los data datos is given está by dado porz 1.2225x 2 0.0096y 2 71.381x 4.121y 354.65. 2 Hallar 2 z y2 z 2 (a) Find zx andy 2. zx 2y 2.(b) Determinar Determine la the concavidad concavity de of las traces trazas parallel paralelas to the al xz- plano plane. xz.Interpretar the el resultado in the en el contexto of the del problem. problema.(c) Determinar Determine la the concavidad concavity de of las traces trazas parallel paralelas to the al yz-plano plane. yz.Interpretar the el resultado in the en el contexto of the del problem. problema.2z2z¿Verdadero True or False? o falso?In Exercises En los ejercicios 129–132, 129 determine a 132, determinar whether si the ladeclaración statement is es true verdadera or false. o If falsa. it is Si false, es falsa, explain explicar why or por give qué anodar example un ejemplo that shows que demuestre it is false. que es falsa.129. Si If z fx, fx, yyand y zx z xzy,z y, entoncesthenz z c xcx y . y.130. Si If zz fxgy, fxgy,then entoncesz x z y f x g y f x g y .2zzx zy 2fxgy f xgy.131. If zz e xy xy ,thenxy 1 e y xxy xy .131. 132.Si If a entonces2 z cylindrical e xy ,surface zyx f xy x, y has 1e rulings xy .parallel to they-axis, thenz y 0.132. Si una superficie cilíndrica z fx, y tiene rectas generatrices133.paralelas Consideral theeje functiony, entoncesdefinedzy by 0.133. Considerar la xyfunción x 2 y 2 definida , porx, y 0, 0fx, yxf x, y 2 y xyx2 2y 2 . 0, , x,x 2 y 2y y 0, 0 0.(a) Find f x 0,x, yand f y x, yx, for y x, y0, 00, 0 .a) (b)Hallar Use thef x x, definitiony y f y x, ofypartialparaderivativesx, y 0, to0.findf x 0, 0andfb) Utilizar y 0, 0 .la definición de derivadas parciales para hallarf 0, 0 y f y 0, 0.f x, 0 f 0, 0x Hint:f x 0, 0lím.x→0 x→0 xfx, 0 f0, 0(c) Use Sugerencia:the definition f x 0, of 0 partial lim lím.x→0derivativesxto findf xy xy0, 0andfc) Utilizar yx yx 0, 0 .la definición de derivadas parciales para hallar(d)f Usingxy 0, 0Theoremy f yx 0, 0.13.3 and the result of part (c), what can besaid aboutf d) Utilizando el xy xy or fteorema yx yx ?13.3 y el resultado del inciso c),y134. Let indicar f x, y qué puede 1 decirse t acerca de f xy o f yx .y134. Sea fx, y 3 dt. Find f x x, y and f y x, y .x135. Consider the function 1 fx, t 3 dt.y Hallar x 3 f x x, y 313 313 yy . f y x, y.x135. Mostrar (a) Findla f xfunción0, 0andf x, f y 0,y 0 .x 3 y 3 13 .a) (b)Hallar Determinef x(0, 0) they pointsf y(0, 0).(if any) at whichf x x, yorf y x, yfails to exist.b) Determinar los puntos (si los hay) en los que f x(x, y) of y x, y no existe.136. Considerar la función f x, y x 2 y 2 23 . Mostrar que136. Consider the function f x, y xf x x, y 2 y 2223 2 3 .Show that4x3x 2 4x y 2 13, x, y 0, 0.f 0,x x, y 3 x 2 y 2 13, x, y 0, 0x, y 0, 0.0,x, y 0, 0PARA MAYOR INFORMACIÓN Para más información sobre esteproblema, FOR FURTHER ver el INFORMATION artículo “A Classroom For more information Note on a about Naturallythisproblem, Occurring see Piecewise the article “A Defined Classroom Function”Note a de Naturally Don Occurring Cohen enPiecewise Mathematics Defined and Computer Function” Education.by Don Cohen in Mathematics andComputer Education.PROYECTO DE TRABAJOS E C T I O N P R O J E C TFranjas de MoiréMoiré FringesLéase el artículo “Moiré Fringes and the Conic Sections” de MikeReadCullen theen articleThe College “Moiré FringesMathematics and theJournal. Conic Sections”El artículo bydescribeMikeCullencómo dos in Thefamilias Collegede curvas Mathematicsde nivel Journal.dadas porThe article describeshow two families of level curves given byfx, y a y gx, y bf x, yaandgx, ybpueden formar franjas de Moiré. Después de leer el artículo, escribircanun documento form Moiréque patterns.explique Aftercómo readingse relaciona the article,la expresiónwrite a paperexplaining how the expressionffx ggx ffy ggyxxyycon las franjas de Moiré formadas por la intersección de las dosisfamilias relatedde tocurvas the Moiréde nivel. patternsUtilizar formedcomo byejemplo intersectinguno de thelos twomo-familiesdelos siguientes.of level curves. Use one of the following patterns as anexample in your paper.Mike CullenMike CullenMike CullenMike Cullen
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A Demostración de teoremas selecci
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ÍNDICE ANALÍtICo I-59Máximo rela