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Math Help - PV integral 2

  1. #1
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    PV integral 2

    Hi dear members,

    Prove it gave me the answer coth(x/2) is an odd function and his integral is 0.

    But the integral is 1/sinh^2(x/2) between -inf and +inf.(see attched Pdf file) and that is -2 coth(x/2)

    Thank you
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