SOLUTION: Find the derivative of the function. y = a^4 + cos^4 x

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Question 993106: Find the derivative of the function.
y = a^4 + cos^4 x
Answer by ikleyn(52848) About Me  (Show Source):
You can put this solution on YOUR website!
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Find the derivative of the function y = a%5E4+%2B+cos%5E4%28x%29.
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As I understand, a is a constant, independent of x. Then

y' = 4%2Acos%5E3%28x%29%2A%28-sin%28x%29%29 = %28-4%29%2Acos%5E3%28x%29%2Asin%28x%29.