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x-এর সাপেক্ষে

\tan^{- 1} \frac{3 x - x^{3}}{1 - 3 x^{2}}

এর অন্তরক কত ?

\frac{3}{1 + x^{2}}

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

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

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

ANS : 1

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