Chapter 4 Trigonometric Functions

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<strong>Trigonometric</strong> <strong>Functions</strong> 35. Scientific Calculator Graphing Calculator .2974 1 SIN − − SIN 1 .2974 ENTER Display (rounded to the nearest degree) 17 If sinθ = 0.2974, then θ ≈ 17 ° . 36. Scientific Calculator Graphing Calculator Display (rounded to the nearest degree) .877 COS -1 COS -1 .877 ENTER 29 If cosθ = 0.877, then θ ≈ 29°. 37. Scientific Calculator Graphing Calculator 1 4.6252 TAN − − TAN 1 If tanθ = 4.6252, then θ ≈ 78 ° . 4.6252 ENTER Display (rounded to the nearest degree) 78 38. Scientific Calculator Graphing Calculator Display (rounded to the nearest degree) 26.0307 TAN -1 TAN -1 26.0307 ENTER 88 If tanθ = 26.0307, then θ ≈ 88 ° . 39. Scientific Calculator Graphing Calculator 1 .4112 COS − − COS 1 If cosθ = 0.4112, then θ ≈ 1.147 radians. .4112 ENTER Display (rounded to three places) 1.147 40. Scientific Calculator Graphing Calculator Display (rounded to three places) .9499 SIN -1 SIN -1 .9499 ENTER 1.253 If sinθ = 0.9499, then θ = 1.253 radians. 41. Scientific Calculator Graphing Calculator 1 .4169 TAN − − TAN 1 If tanθ = 0.4169, then θ ≈ 0.395 radians. .4169 ENTER Display (rounded to three places) .395 42. Scientific Calculator Graphing Calculator .5117 If tanθ = 0.5117, then θ = 0.473 Display (rounded to three places) 1 TAN − TAN − 1 .5117 ENTER .473 512 Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall.
PreCalculus 4E Section 4.3 43. π tan 3 1 3 1 − = − 2 π sec 2 6 1 π cos 6 3 1 = − 2 1 3 2 3 3 = − 2 2 = 0 44. 45. 46. 1 2 1 2 − = − π π cot csc 4 6 1 2 = − 1 1 π π tan sin 4 6 1 1 1 1 2 1 2 = − 1 2 = 1−1 = 0 2 2 1+ sin 40°+ sin 50° 2 2 = 1+ sin (90°− 50 ° ) + sin 50° 2 2 = 1+ cos 50°+ sin 50° = 1+ 1 = 2 2 2 1− tan 10°+ csc 80° 2 2 = 1− cot 80°+ csc 80° 2 2 = 1+ csc 80°− cot 80° = 1+ 1 = 2 47. csc37° sec53°− tan 53° cot 37° = sec53° sec53°− tan 53° tan 53° 2 2 = sec 53°− tan 53° = 1 48. cos12° sin 78°+ cos 78° sin12° = sin 78° sin 78°+ cos 78° cos 78° 2 2 = sin 78°+ cos 78° = 1 513 Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall.
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Page 3 and 4: PreCalculus 4E Section 4.1 16. 17.
Page 7 and 8: PreCalculus 4E Section 4.1 88. Firs
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Chapter 4 Trigonometric Functions

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