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## Main Question or Discussion Point

Hi Guys/Girls,

I have a maths exam tomorrow and there is a chance I could be asked to prove the

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

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