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## Homework Statement

Evaluate the integral.

http://www.freeimagehosting.net/uploads/176e17ca2f.jpg

## Homework Equations

http://www.freeimagehosting.net/uploads/3168397520.jpg

## The Attempt at a Solution

http://www.freeimagehosting.net/uploads/3168397520.jpg

I am stuck here as the book gives an answer pi/4.

Please help.

Thankyou

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