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BNC: 29985 COCA: 38566
cosinenoun [ C ]uk/ˈkəʊ.saɪn/ us/ˈkoʊ.saɪn/ written abbreviation cos specialized

(in a triangle that has one angle of 90°) the ratio of the length of the side next to an angle less than 90°, divided by the length of the hypotenuse (= the side opposite the 90° angle)余弦


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