differentiation

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



1) 0
2) $\frac{1}{{\sqrt x + 1}}$
3) 1
4) None of these
Solution: Explanation: Explanation
standard-differentiation

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