Where does the -2bc term come from in the cosine law? – math.stackexchange.com

Where does the -2bc term come from in the cosine law? – math.stackexchange.com

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I understand that in the cosine rule i.e. $c^2 = a^2 + b^2 - 2ab \cos C$, the cosine function acts to bring down the value of $c^2$ for acute angles ($\cos C>0$, $-2ab\cos C<0$ ) and increase ...

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