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Thread: Trig Identity

  1. April 18th 2010, 05:39 PM #1
    advancedfunctions2010
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    Exclamation Trig Identity

    How would you simplify/solve this?

    cos(x+x) + sin²x

    = cosxcosx - sinxsinx + sin²x

    = ?






    thanks
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  2. April 18th 2010, 05:43 PM #2
    skeeter
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    Quote Originally Posted by advancedfunctions2010 View Post
    How would you simplify/solve this?

    cos(x+x) + sin²x

    = cosxcosx - sinxsinx + sin²x

    = ?
    simplify ...

    cos^2{x} - \sin^2{x} + \sin^2{x} = \cos^2{x}
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