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Math Help - Derivative of a trig function

  1. #1
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    Derivative of a trig function

    Hi,

    Im confused on what im doing wrong here to simplify this derivative.

    The book comes up with a different answer.
    Attached Thumbnails Attached Thumbnails Derivative of a trig function-img_0054.jpg  
    Last edited by minneola24; February 9th 2013 at 05:13 PM.
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  2. #2
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    Re: Derivative of a trig function

    When you used the chain rule, you should have multiplied instead of subtracting:

    f'(t)=6(\sec(\pi{t}-1))(\sec(\pi{t}-1)\tan(\pi{t}-1))(\pi)

    f'(t)=6\pi\sec^2(\pi{t}-1)\tan(\pi{t}-1))

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