Question: (a) If is a positive integer, prove that (b) Find a formula for the derivative of y = cosnx cos nx that is similar to

(a) If is a positive integer, prove that

(b) Find a formula for the derivative of y = cosnx cos nx that is similar to the one in part (a).

(sin

(sin"x cos nx) n sin"-'x cos(n + 1)x dx

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