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\int \frac{{(\tan^{- 1} x)}^{2}}{1 + x^{2}} d x = ?

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

\frac{1}{3} {(\tan^{- 1} x)}^{3}

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

(\tan^{- 1} x) 3

কোনোটিই নয়

ANS : 2

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