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int(0)^(1) (dx)/(x^(2)+2x sin alpha +1)=...

`int_(0)^(1) (dx)/(x^(2)+2x sin alpha +1)=`

A

`( pi/4 - alpha/2) cosec alpha`

B

`( pi/4 + alpha/2) cosec alpha`

C

`( pi/4 + alpha/2) sec alpha`

D

`( pi/4 - alpha/2) sec alpha`

Text Solution

Verified by Experts

The correct Answer is:
D
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