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    cheychey87's Avatar
    cheychey87 Posts: 1, Reputation: 1
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    #1

    Mar 24, 2011, 10:18 PM
    prove that cos((pi/2-x)-y)=sin(x y)?
    Help help trig trig help
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 25, 2011, 07:37 AM

    Please note that for some reason this site loses any "+" signs that you put in the subject header for your question. I assume what you mean is this:



    This is a siimple use of the identities for and , and also use of and .

    Alternatively if you recognize that and apply the identity for then it comes right out.
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