How do you find the derivative of $cos^4(x^7)$ ?

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Answer 1 · 2015-10-19T09:54:14

$-28x^6cos^3(x^7)sin(x^7)$

By using the power rule in conjunction with other rules of differentiation, we get

$d/dx cos^4(x^7)=4cos^3(x^7)*(-sin(x^7))*(7x^6)$

How do you find the derivative of cos^4(x^7) cos^4(x^7) ?