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What is the value of the definite integral int limits 0^...

This question belongs to Engineering Maths Calculus
Calculus
?

What is the value of the definite integral, $$\int\limits_0^{\text{a}} {\frac{{\sqrt {\text{x}} }}{{\sqrt {\text{x}} + \sqrt {{\text{a}} - {\text{x}}} }}} {\text{dx}}\,{\text{?}}$$

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Correct Answer: Option B
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