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Math Help - I don't understand how this is true? (derivatives)

  1. #1
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    I don't understand how this is true? (derivatives)

    How is the answer in part a the derivative of the given function? Here's the problem:
    ImageShack® Math problem help

    I get: s'(t) = A(-sin(wt+d)) x d/dx (wt+d)

    but isnt the derivative of (wt+d), when w and d are constants, 0?
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  2. #2
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    \frac{d}{dt}(wt+d)= w
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  3. #3
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    nevermind. I got it now. Thanks !
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