differentiation

Question: $\frac{d}{{dx}}\log (\sqrt {x - a} + \sqrt {x - b} ) = $



1) $\frac{1}{{2[\sqrt {(x - a)} + \sqrt {(x - b)} ]}}$
2) $\frac{1}{{2\sqrt {(x - a)(x - b)} }}$
3) $\frac{1}{{\sqrt {(x - a)(x - b)} }}$
4) None of these
Solution: Explanation: Explanation
standard-differentiation

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