differentiation

Question: If $y = {\cot ^{ - 1}}\left( {\frac{{1 + x}}{{1 - x}}} \right)$, then $\frac{{dy}}{{dx}} = $



1) $\frac{1}{{1 + {x^2}}}$
2) $ - \frac{1}{{1 + {x^2}}}$
3) $\frac{2}{{1 + {x^2}}}$
4) $ - \frac{2}{{1 + {x^2}}}$
Solution: Explanation: Explanation
standard-differentiation

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