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    texasgal28's Avatar
    texasgal28 Posts: 1, Reputation: 1
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    #1

    Apr 17, 2012, 06:43 PM
    cos(alpha-beta)/(sin(alpha)cos(beta))=cot(alpha)+tan(beta)
    Proving Identites. Make one side equal the other.This is for a Precalculus college class.in Texas.
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    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Apr 18, 2012, 05:40 AM
    Expand the cos(A-B) term to cos(A)cos(B)+sin(A)sin(B) and it works right out.
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