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a2 b2 c2 2bc cos a
a2 b2 + c2 - 2bc cos a
c2 a2 + b2 - 2ab * cos c
cos a b2+c2-a2 2bc
cos a 2+b 2-c 2
a2+b2+2ab cos
cos a b 2 + c 2
cos a+b 2
c 2 a 2 + b 2 - 2ab cos c
cos 2 a + cos 2 b
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