What is the meaning of this mathematical function COS
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COS is a trigonometric function that returns the cosine of an angle. The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse. In a unit circle, the cosine of an angle is the x-coordinate of the point on the circle at that angle. The COS function is used in mathematics, physics, engineering, and other fields where trigonometry is applicable.
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