(a) If is a positive integer, prove that (b) Find a formula for the derivative of y...
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(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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(sin"x cos nx) n sin"-'x cos(n + 1)x dx
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a dr sin x cos nx n sin n sin I cos e cos n sin x cosnx x 1 x cosn 1ri 41 ...View the full answer
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