differentiation

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



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

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