Cos (a-b) +cos (b-c) + cos (c-a) = -3/2Prove that cos a + cos b+ cos c = sin a + sin b + sin c = 0
Cos (a-b) +cos (b-c) + cos (c-a) = -3/2
Prove that cos a + cos b+ cos c = sin a + sin b + sin c = 0
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