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\frac{d}{d x} (\tan^{- 1} \frac{2 x}{1 - x^{2}}) = ?

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

1 + x^{2}

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

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

ANS : 2

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