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\int \frac{d x}{e^{x} + e^{- x}}

= কোনটি?

\sin^{- 1} (e^{x})

\frac{1}{1 + e^{x}}

\cos^{- 1} (e^{- x})

\tan^{- 1} (e^{x})

ANS : 4

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