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

কত ?

\frac{1}{1 + x}

\frac{\sqrt{x}}{2 (1 + x)}

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

\frac{1}{2 \sqrt{x} (1 + x)}

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

ANS : 4

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