If C (dot) C= IC^2I how can I prove cosine law with vectors?

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- Jun 10th 2012, 06:16 PMClairvoyantskiProve Cosine law using vectors!
If C (dot) C= IC^2I how can I prove cosine law with vectors?

- Jun 10th 2012, 06:46 PMReckonerRe: Prove Cosine law using vectors!