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

\frac{{(c o t^{- 1} x)}^{3}}{3}

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

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

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

ANS : 4

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