Question
यदि $y = \sin \left( {\frac{{1 + {x^2}}}{{1 - {x^2}}}} \right)$, तो $\frac{{dy}}{{dx}} = $
$ = \frac{{4x}}{{{{(1 - {x^2})}^2}}}\cos \left( {\frac{{1 + {x^2}}}{{1 - {x^2}}}} \right)$.
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