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\frac{1}{2} \sin^{- 1} \frac{2 x}{1 + x^{2}} + c o t^{- 1} x

এর মান কত?

\frac{π}{2}

- \frac{π}{2}

\pm \frac{π}{2}

\frac{\sqrt{π}}{2}

ANS : 1

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