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19 May, 17:39

The law of cosine is c2 = a2 + b2 - 2ab cos C. find the value of 2ab cos C

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  1. 19 May, 18:27
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    Add 2ab cos C to both sides of the '=':-

    c2 + 2ab cos C = a2 + b2

    now subtract c2 from both sides:-

    2ab cos C = a2 + b2 - c2
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