Photos COS A B

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Cos a b. A2 b2 c2 2bc cos a. Law of cosines. C2 a2 b2 2ab cos c. A 2 B 2 C 2 2bc cosa.
A2 b2 c2 2bc cos a. Law of cosines. C2 a2 b2 2ab cos c. A 2 B 2 C 2 2bc cosa.

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