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Thread: Another proof of trig identity =((

  1. June 1st 2009, 02:59 AM #1
    iiharthero
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    Another proof of trig identity =((

    1/(cotA-cosecA) + 1/(cotA+cosecA) = -2cotA

    PLEASE help proveee !!!

    THANKYOU
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  2. June 1st 2009, 03:34 AM #2
    alexmahone
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    \frac{1}{cot A - cosec A}+\frac{1}{cot A+ cosec A}
    = \frac{2cot A}{cot^2A-cosec^2A}
    = \frac{-2cot A}{cosec^2A-cot^2A}
    = -2cot A
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