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e^{x} = \tan y

\frac{d y}{d x}

এর মান কোনটি?

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

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

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

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

ANS : 1

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