f(x) = 9sin(cos(x^6)) I think im supposed to use the chain rule here but not sure how.
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$\displaystyle f(x)=9\sin(\cos x^6)\implies f'(x)=9\cos(\cos x^6)\cdot(\cos x^6)'$ Can you take it from there?
yes yes. thank you very much. i really need to study this mess.
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