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Math Help - prove this identity please

  1. #1
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    prove this identity please

    COT(X-Y) = (COTXCOTY+1)/(COTY-COTX)

    Does Cot(x-y) = 1/(tan(x-y)) ????
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  2. #2
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    I will attached the solutions... Hope u understand
    Attached Files Attached Files
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  3. #3
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    I got it the same way. Thanks
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  4. #4
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    No problem at all
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