differentiation

Question: If $f(x) = x{\tan ^{ - 1}}x$, then $f'(1)$=



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

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