Question: (a) If is a positive integer, prove that d/dx (sinn x cos nx) = n sinn-1 x cos(n + 1)x (b) Find a formula for

(a) If is a positive integer, prove that
d/dx (sinn x cos nx) = n sinn-1 x cos(n + 1)x
(b) Find a formula for the derivative of y = cosn x cos nx that is similar to the one in part (a).

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