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cosine

Auslan SignbankDictionary#5038 FS:COS(cosine)
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As a Noun: 1. In mathematics and geometry, this is one of the trigonometric functions which relate an angle of a right-angled triangle to ratios of two side lengths. This one is equal to the ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse. English = cosine.