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f (x) = \tan^{- 1} (e^{x}) হলে \begin{matrix} L t \\ h \to 0 \end{matrix} \{\frac{f (x + h) - f (x)}{h}\}

মান কোনটি?

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

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

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

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

ANS : 3

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