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int(0)^(pi//2)(1)/(a^(2).sin^(2)x+b^(2)....

`int_(0)^(pi//2)(1)/(a^(2).sin^(2)x+b^(2).cos^(2)x)dx` is equal to

A

1.`(pi a)/(4b)`

B

2.`(pi a)/(2b)`

C

3`(pi b)/(4a)`

D

4.`(pi)/(2ab)`

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The correct Answer is:
D
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