In triangle ABC, If vertex A is at origin then the law of cosine is.

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In triangle ABC, If vertex A is at origin then the law of cosine is:

a2=b2+c2-2bccosβ

a2=b2+c2+2bccosα

a2=b2+c2+2bccosβ

a2=b2+c2-2bccosα