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Evaluate of each of the following integr...

Evaluate of each of the following integral: `int_0^a(sqrt(x))/(sqrt(x)+sqrt(a-x))dx`

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Let I=`int_0^a(sqrt(x))/(sqrt(x)+sqrt(a-x))dx...(1)`
I=`int_0^a(sqrt(a-x))/(sqrt(a-x)+sqrt(x))dx...(2)`
(1)+(2)
`2I=int_0^a dx`
`2I=a`
`I=a/2`
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