(a) If is a positive integer, prove that ddx "sinnx cos nx# ! n sinn#1x cos"n % 1#x b)

Chapter 3, Problem 3.4.91

(choose chapter or problem)

(a) If is a positive integer, prove that ddx "sinnx cos nx# ! n sinn#1x cos"n % 1#x b) Find a formula for the derivative of y ! cosnx cos nx that is similar to the one in part (a).

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