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3Â¥2016-12-07 14:02:26
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2Â¥: Originally posted by hylpy at 2016-12-07 11:57:03
\int \frac{e^{x}+e^{-x}}{(e^{x}-e^{-x})^{2}+1}dx=\int \frac{d(e^{x}-e^{-x})}{(e^{x}-e^{-x})^{2}+1}

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