ratio of the hypotenuse to the opposite side of a right-angled triangle
同义词：cosec
cosecant详细解释
co.se.cant n.Abbr. csc,cosecMathematics （名词）缩写 csc,cosec【数学】 The reciprocal of the sine of an angle in a right triangle.余割：直角三角形中一个角正弦的倒数The secant of the complement of a directed angle or arc.余割：有向角的余角或弧的余割
