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$\int \frac{dx}{{(e^{x} + e^{- x})}^{2}}$ =?

\frac{1}{2 (e^{2 x} + 1)} + c

\frac{- 1}{2 (e^{2 x} + 1)} + c

\frac{1}{2 e^{2 x}} + c

\frac{- 1}{2 e^{2 x}} + c

ANS : 2

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