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$e^{y} = \tan^{- 1} x$ হলে $\frac{d x}{d y} = ?$

\sqrt{1 + x^{2}} \tan^{- 1} x

(1 + x^{2}) \tan^{- 1} x

\sqrt{1 - x^{2}} \tan^{- 1} x

(1 - x^{2}) \tan^{- 1} x

ANS : 2

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