I'll use the letters A, B, C for the angles of the triangles instead of .

We have . Then

Divide by :

Using that we have

Now, using the formula and we have

Divide all terms by and we get

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- October 9th 2009, 11:09 PM #1

- Joined
- Nov 2007
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- October 10th 2009, 01:18 AM #2