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

\frac{d y}{d x}

এর মান -

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

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

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

\frac{1}{(x^{2} + 1)^{3}}

ANS : 4

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