Question
$\int_{}^{} {x\sqrt {\frac{{1 - {x^2}}}{{1 + {x^2}}}} } \;dx = $
$ = \frac{1}{2}[{\sin ^{ - 1}}({x^2}) + \sqrt {1 - {x^4}} ] + c$.
(${x^2} = t$तथा $\sqrt {1 - {x^4}} = \sqrt t $ रखने पर )
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