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Math Help - I need help with this trig question...

  1. #1
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    I need help with this trig question...

    Express as a single trig function:
    how can I solve this question: 2cos^2 (pie/4)-1

    THanks
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  2. #2
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    Quote Originally Posted by Ttops View Post
    Express as a single trig function:
    how can I solve this question: 2cos^2 (pie/4)-1
    double angle identity ...

    \cos(2x) = 2\cos^2{x} - 1



    fyi ...

    this is pie



    this is pi ...

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