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Math Help - write as single trigonometric function

  1. #1
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    write as single trigonometric function

    how do u turn this into a single trigonometric funstion:

    cos^2x - sin^2x

    thx
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  2. #2
    Senior Member Twig's Avatar
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    There is a trig identity:

     cos^{2}(x)-sin^{2}(x)=cos(2x)
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