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$\int \frac{d x}{e^{x} + e^{- x}}$ এর মান কত? (What is the value of $\frac{d^{2} y}{d x^{2}} ?$ )

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

\tan (e^{- x})

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

\tan (e^{x})

ANS : 0

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