With the aid of the substitutions e^x=\tan \theta and \cosh x=\frac {1}{2}\left (e^x+e^{-x}\right ) , evaluate the integral \displaystyle \int{sech} x \,dx .

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With the aid of the substitutions e^x=\tan \theta and \cosh x=\frac {1}{2}...

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With the aid of the substitutions $e^x=\tan \theta$ e^x=\tan \theta and $\cosh x=\frac {1}{2}\left (e^x+e^{-x}\right )$ \cosh x=\frac {1}{2}\left (e^x+e^{-x}\right ), evaluate the integral $\displaystyle \int{sech} x \,dx$ \displaystyle \int{sech} x \,dx.

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