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Evaluate : int0^1sqrt(x(1-x))dx...

Evaluate : `int_0^1sqrt(x(1-x))dx`

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`int_0^1sqrt(x(1-x))dx`
Let,
`x=sin^2theta`
`dx=2sinx cosx d(theta)`
`dx=sin2(theta) d (theta)`
when `x=0` `theta=0`
when `x=1 theta=(pi)/2`
...
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