The cosine function (or cos function) in a triangle is the ratio of the adjacent side to that of the hypotenuse. The cosine function is one of the three main primary trigonometric functions and
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The length of the adjacent side divided by the length of the hypotenuse. The abbreviation is cos. cos (θ) = adjacent / hypotenuse.
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The cosine function is one of the basic functions encountered in trigonometry (the others being the cosecant , cotangent, secant, sine , and tangent ). Let be an angle measured counterclockwise from the x -axis along the arc of the unit
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