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law of cosines
(redirected from Cosine rule)

    Also found in: Wikipedia, Hutchinson 0.02 sec.

law of cosines

Generalization of the Pythagorean theorem relating the lengths of the sides of any triangle. If a, b, and c are the lengths of the sides and C is the angle opposite side c, then c2 = a2 + b2 − 2ab cos C.



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