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find-cosx-e-x-e-x-dx-




Question Number 28976 by abdo imad last updated on 02/Feb/18
find ∫_(−∞) ^(+∞)    ((cosx)/(e^x +e^(−x) ))dx.
$${find}\:\int_{−\infty} ^{+\infty} \:\:\:\frac{{cosx}}{{e}^{{x}} +{e}^{−{x}} }{dx}. \\ $$

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