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যদি

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

হয়, তবে f(x)= ?

log(

e^{x} + e^{- x}

)

e^{x} + e^{- x}

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

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

ANS : 4

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