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Math Help - verifying a trigonometric identity

  1. #1
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    verifying a trigonometric identity

    how would you verify (cosx-cosy)/(sinx+siny) + (sinx-siny)/(cosx+cosy) =0
    Last edited by wolfxpax; May 3rd 2009 at 03:53 PM.
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  2. #2
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    Quote Originally Posted by wolfxpax View Post
    how would you verify (cosx-cosy)/(sinx-siny) + (sinx-siny)/(cosx+cosy) =0
    Don't forget to use parentheses (as in red above) to make the meaning unambiguous. Also, it looks to me as though one of those signs should be a +.

    Anyway, to prove the identity, put the left side over a common denominator, and see what happens to the numerator.
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