- #1

GroupTheory1

- 7

- 0

## Homework Statement

Here is a drawing with all the needed variables:

http://i.imgur.com/192GI.jpg

## Homework Equations

## The Attempt at a Solution

I have been trying to figure out how this approximation is derived for some time now and have no progress to show for it. Any help in figuring out the steps would be greatly appreciated.