Cosine Proof

  • #1
Hi Guys/Girls,

I have a maths exam tomorrow and there is a chance I could be asked to prove the cosine rule or sine rule.

Well I have a simple proof of the sine rule but cannot find a simple one for the cosine. They all seem very advanced.

Would anybody have a straightforward proof for the cosine rule?

Thanks,
atwarwithmaths
 

Answers and Replies

  • #3
Thats perfect thanks.. Stupid me, I turn to wikipedia for everything else.!
 

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