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y = \frac{(1 + x}{(1 - x)}

\frac{d y}{d x}

এর মান -

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

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

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

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

ANS : 3

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