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যদি

\int \frac{e^{x} - e^{- x}}{e^{x} + e^{- x}} dx = f (x) + c

\log (e^{x} - e^{- x})

\log (e^{x} + e^{- x})

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

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

ANS : 2

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