how would you verify (cosx-cosy)/(sinx+siny) + (sinx-siny)/(cosx+cosy) =0
Last edited by wolfxpax; May 3rd 2009 at 02:53 PM.
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Originally Posted by wolfxpax 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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