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Math Help - I am mad with sech, csch

  1. #1
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    I am mad with sech, csch

    There are two versions of integral on the web and the in the books for sech(x) and csch(x).

    there are arctan(sinh(x)) and arctan(tanh(x/2)) for sech(x)
    ln(tanh(x/2)) and -arccot(cosh(x)) for csch(x)

    but I can't see any relationship between these two, any one help pleese.
    Last edited by 9318047; October 28th 2008 at 05:49 PM.
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