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The Law of Cosines is used to find the remaining parts of an oblique (non-right) triangle when either the lengths of two sides and the measure of the included angle is known (SAS) or the lengths of the three sides (SSS) are known. The Law of Cosines states: ... c2=a2+b2−2ab cosC .
mackgamey19

Answer:

a law in trigonometry

Explanation:

the square of a side of a plane triangle equals the sum of the squares of the remaining sides minus twice the product of those sides and the cosine of the angle between them.

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