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29 September, 13:11

CosA+cosB+cosC+cos (A+B+C) = cos (A+B). cos (B+C). cos (C+A)

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  1. 29 September, 16:28
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    cos (A+B+C)

    Step-by-step explanation:

    as A, B, C, are triangle we have A, B and C as 180

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