| 释义 |
co·sine AHD[kōʹsīn'] D.J.[ˈkəʊˌsaɪn]K.K.[ˈkoˌsaɪn]n.（名词）abbr. cos【缩写】 cos θ= b/cClarinda/Academy Artworks- In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse.余弦：直角三角形锐角边的边长与叙边的比
- The abscissa at the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of lengthx and measured counterclockwise from the point (1, 0) if x is positive or clockwise if x is negative. 余弦：以笛卡儿坐标系原点为圆心的单位圆的圆弦端点的横坐标，弧的长度为x ，如果 x 为正，弧的长度则从（1，0）点按逆时针方向算起，若 x 为负，则按顺时针方向从（1，0）点算起
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