檢視正弦的原始碼

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中文名；正弦

外文名；Sine

读音；Zhèngxián

分类；数学术语
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'''正弦'''（sine），数学术语，在直角三角形中，任意一[[锐角]]∠A的对边与斜边的比叫做∠A的正弦，记作sinA（由英语sine一词简写得来），即sinA=∠A的对边/[[斜边]]。

[[古代]]说法，正弦是股与弦的[[比例]]。<ref>[https://xinzhi.wenda.so.com/a/1522662613612805 初三数学--正弦值,余弦值和正切值], 360新知, 2018-04-02 </ref>