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

হলে f'(x)এর মান কত?

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

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

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

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

ANS : 2

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