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12 July, 17:35

Which of following is a key element in the proof of the law of cosines

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  1. 12 July, 17:53
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    In proving using the law of cosines, you need to consider these two key elements. The first element is a^2 + b^2 - 2abcosC and the second one is cosine^2 theta + sin^2 theta is equal to 1. Law of Cosines is derived from the Pythagorean Theorem
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