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int(0)^(pi//2)(tan^(7)x)/(cot^(7)x + tan...

`int_(0)^(pi//2)(tan^(7)x)/(cot^(7)x + tan^(7)x)dx` is equal to

A

1.`(pi)/(2)`

B

2.`(pi)/(4)`

C

3.`(pi)/(6)`

D

4.`(pi)/(3)`

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The correct Answer is:
B
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