differentiation

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



1) $\frac{1}{2\sqrt{1-{{x}^{2}}}}$
2) $1-\sqrt{1-{{x}^{2}}}$
3) $\frac{1}{2}$
4) $\frac{1}{\sqrt{1-{{x}^{2}}}}$
Solution: Explanation: No Explanation
Differentiation by substitution Higher order derivatives

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