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y = \tan^{- 1} \frac{2 x}{1 - x^{2}}

\frac{d y}{d x}

এর মান -

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

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

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

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

ANS : 1

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