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2 \tan^{- 1} x

এর মান কত ?

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

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

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

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

ANS : 1

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