The law of cosine is A squared + B squared -2abcosC. find he value of 2abcosC Side a is 2. Side b is 4. Side c is 5 A.37 B.20 C.40 D.-40

The law of cosine is A squared + B squared -2abcosC. find he value of 2abcosC Side a is 2. Side b is 4. Side c is 5 A.37 B.20 C.40 D.-40

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