Hey guys.

I have this problem:

http://img12.imageshack.us/img12/6729/91881544.jpg

It's like a two parts problem.

The first one was to prove the equation in red, I did that with a bit of trigo.

The second part is to use the integral of the function in green to prove the thing in yellow. I'm stuck on the path that goes from - epsilon to epsilon, that semi circle, how can I find the value of this function on the path?

Thanks.