- #1

Minihoudini

- 28

- 0

## Homework Statement

Im righting this down for my roommates since he's having tons of trouble trying to figure this out and I can't answer it.

also sorry for having to hotlink it.

http://i.imgur.com/afShz.jpg

the equation is on the image since its very difficult to type it all out. Apologies about that.

we understand everything up till the 2 is introduced and the integral goes from 0 to pi/6. We don't understand how you are able to just introduce a 2 and take out the -pi/6.