Functions of Multiple Angles In Exercises 61-68, solve the multiple-angle equation. 61. cos== 0
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- Functions of Multiple Angles In Exercises 61-68, solve the multiple-angle equation. 67. cos KIN || √2 2sin2(78°) + cos2(78°)Trigonometry In Exercises 55-58, sketch the graph of the given function. What is the period of the function? 55. y = cos 2x 56. y = sin 57. y = sin 7x 58. y = cos 2 59. Sketch the graph y = 2 cos x - 3