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Cosine Proof

  1. May 19, 2008 #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
     
  2. jcsd
  3. May 19, 2008 #2
  4. May 19, 2008 #3
    Thats perfect thanks.. Stupid me, I turn to wikipedia for everything else.!
     
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