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余弦平方加正弦平方等于多少
更新时间: 2020-09-22 00:00:00  

正弦和余弦:是一种数学术语,是基本物理概念。在直角三角形中,任意一锐角的对边与斜边的比叫做该角的正弦;任意一锐角的邻边与斜边的比叫做角的余弦。

古代说法,正弦是股与弦的比例。正弦函数﹑余弦函数﹑正切函数﹑余切函数﹑正割函数与余割函数合称为三角函数。

关键词: 余弦 平方 正弦 等于 多少

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