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How do you do the law of cosines ?
 Nov 28, 2012
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Let the sides be a, b, and c.

 

\(c^2 = a^2 + b^2 - 2ab \cos C.\)

 

You can replace c, a, and b interchangeably. This should help:

 

https://en.wikipedia.org/wiki/Law_of_cosines

 Feb 21, 2021

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