Here it is

which means

I get stuck here

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- Jan 2nd 2009, 01:34 AMBeardIntegration by substitution MkII
Here it is

which means

I get stuck here - Jan 2nd 2009, 01:44 AMflyingsquirrel
- Jan 2nd 2009, 02:09 AMtom@ballooncalculus
Just in case it appeals...

http://www.ballooncalculus.org/cosSub.png

This is only an overview - the lower equality relies on the pythag identity.

Balloon Calculus: worked examples from past papers