differentiation

Question: If $y = \log {\left( {\frac{{1 + x}}{{1 - x}}} \right)^{1/4}} - \frac{1}{2}{\tan ^{ - 1}}x,$then $\frac{{dy}}{{dx}} = $



1) $\frac{{{x^2}}}{{1 - {x^4}}}$
2) $\frac{{2{x^2}}}{{1 - {x^4}}}$
3) $\frac{{{x^2}}}{{2\,\,(1 - {x^4})}}$
4) None of these
Solution: Explanation: Explanation
standard-differentiation

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