differentiation

Question: The differential coefficient of ${{\tan }^{-1}}\left( \frac{\sqrt{1+x}-\sqrt{1-x}}{\sqrt{1+x}+\sqrt{1-x}} \right)$ is



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

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