What is the derivative of cos^4(x) + cos (x^4)?

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Answer 1 · 2018-01-24T00:07:07

Let #f(x) = cos^4(x) + cos(x^4)#
Then #f'(x) = 4cos^3(x) * (-sinx) - sin(x^4) * 4x^3#
Simplify.