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9 May, 11:44

Cos (65) = square root 1+cos (130) / 2

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  1. 9 May, 15:17
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    Step-by-step explanation:

    Cos (65°) = √ (1 + cos (130°)) / 2

    0.42=√ (1 - 0.64) / 2

    0.42=√ (0.36) / 2

    0.42²=√0.18²
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