What is the derivative of $y = a^9 + (cos(x))^9$ ?

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Answer 1 · 2015-07-22T17:08:22

$-9cos^8 x sinx$

Use power rule to differentiate $cos^9 x$ w.r.t cosx and then chain rule to differentiate cos x w.r.t x

What is the derivative of y = a^9 + (cos(x))^9y = a^9 + (cos(x))^9?