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cotangent n. 余切 余切 cotangent n 1: ratio of the adjacent to the opposite side of a right- angled triangle [synonym: {cotangent}, {cotan}] Cotangent \Co*tan"gent\ (k?-t?n"jent), n. [For co. tangens, an
abbrev. of L. complementi tangens. See {Tangent}.] (Trig.) The tangent of the complement of an arc or angle. See Illust. of {Functions}. [1913 Webster]
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