Cosines, Law of

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Cosines, Law of

a law of trigonometry asserting that the square of a side of a triangle is equal to the sum of the squares of the other two sides less twice the product of these sides by the cosine of the angle between them:

c² = a² + b²—2 ab cos α

Here, a, b, and c are the sides of the triangle and α is the angle between sides a and b.

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