zhèng xián
意思解释：（Sine）除了在角的终边上的顶点外，任何点的 Y 坐标被该点和顶点的距离所除，顶点和平面直角坐标系的原点重合，而角的初始边和正 X 轴相重合。
三角函数之一。1610年利玛窦《理法器撮要》:“割圆弧矢:正矢、正弦、余弦、余矢。”1857年伟烈亚力编《六合丛谈》七:“《赤水遗珍》载，泰西杜氏德美有不须开方祗立乘除之数，求周径密率及正弦正矢捷法，则弧背不问若干度分，但…
One of trigonometric function. 1610 benefit Ma antrum brief points of manage musical instruments used in a Buddhist or Taoist mass : Case seal not ∈ versine, sine, Yu Xian, Yu Shi. 1857 Wei intense inferior is force made up 6 add up to Cong Tan 7: Ah aspic hey does Ju of ┪ of of stand upright of Fen of Huan of lossen soil with a hoe climb of oxime of suddenly of force of the brand that tie stay away from home does Yan of food container of of of of cracking ⒊ suitable see Li only then stop does art add Jie of Shen ǎ does mew shake what of Xi of be addicted to truly Zheng
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