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

এর মান কত?

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

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

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

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

ANS : 2

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