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$\sin^{- 1} \cdot 2 x$ এর অন্তরজ কত?

\frac{2}{\sqrt{1 - 4 x^{2}}}

\frac{1}{\sqrt{1 - 4 x^{2}}}

\frac{- 2}{\sqrt{1 - 4 x^{2}}}

\frac{1}{2 \sqrt{1 - 4 x^{2}}}

ANS : 1

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