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$\int \frac{d x}{\sqrt{(e^{2 x} - 1)}} = ?$

- s i n^{- 1} e^{- x}

- s i n^{- 1} e^{- x} + c

- s i n^{- 1} e^{x}

\sin^{- 1} e^{- x} + c

ANS : 2

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