trig

Prove : (sinA-cosA+1)/(sinA+cosA-1) = (1+sinA)/cosA

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  1. multiply top and bottom of the left side by
    (sinA + cosA + 1) and expand carefully

    remember sin^2A + cos^2A = 1
    and in the bottom replace the
    -cos^2A with (1-sin^2A)

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