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

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asked Jun 2, 2017 227k views

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Abraham Duran · Answer 1 · 2017-06-08T15:56:53+0000

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

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

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