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$\frac{d}{d x} (\tan^{- 1} \frac{4 x}{1 - 4 x^{2}}) =$ কোনটি?

\frac{4}{1 + 4 x^{2}}

\frac{4}{1 + 2 x^{2}}

\frac{2}{1 + 4 x^{2}}

\frac{6}{1 + 4 x^{2}}

ANS : 1

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