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6 February, 16:18

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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Answers (1)
  1. 6 February, 19:47
    0
    D I think but not 100% sure
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