Cosine, one of the six trigonometric functions, which, in a right triangle ABC, for an angle A, is cos A = length of side adjacent to angle A length of hypotenuse .(The other five trigonometric functions are sine [sin], tangent [tan], secant [sec], cosecant [csc], and cotangent [cot].) From the
Definition--Trig Concepts--Cosine Ratio
Cosine -- from Wolfram MathWorld
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Section 4: Sine And Cosine Rule
