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词汇	sine
释义	sine AHD[sīn] D.J.[saɪn]K.K.[saɪn]n.Abbr. sinMathematics （名词）缩写 sin【数学】 sin θ= a/cClarinda/Academy Artworks The ordinate of 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. 正弦：中心在笛卡尔坐标系原点的一个单位园上的一端点的纵坐标，弧长为X 如果 X 为正，其长由点（1,0）开始逆时针测量如 X 为负，其长度按顺时针方向测量 In a right triangle, the ratio of the length of the side opposite an acute angle to the length of the hypotenuse.正弦：在一个直角三角形中，锐角所对边长度与斜边长度之比 Etymology语源 Medieval Latin sinus mistranslation of Arabic jayb [sine] as if jayb [fold in a garment] 中世纪拉丁语 sinus 阿拉伯语 jayb的错译 [正弦] 似乎为 jayb [衣服上的皱褶] from Latin [curve, fold] 源自 拉丁语 [曲线，皱褶]
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