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\sin (2 \tan^{- 1} x)

এর মান কোনটি?

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

\frac{2 π}{1 - x^{2}}

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

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

ANS : 3

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