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Math Help - [SOLVED] derivative question

  1. #1
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    [SOLVED] derivative question

    If y= cos^2[x]-sin^2[x] then y'=

    I know how to do it if the exponent is after the x, but how would this be done? The answer key says -2sin(2x). Thanks
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  2. #2
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    Quote Originally Posted by jst706 View Post
    If y= cos^2[x]-sin^2[x]
    Note that \cos^2x-\sin^2x=\cos2x, now take the derivative.
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