2025年教学资料:4.4 同角三角函数的基本关系
4.4同角三角函数的基本关系4.4同角三角函数的基本关系情境导入探索新知例题辨析巩固练习归纳总结布置作业之间有什么关系么?4.4同角三角函数的基本关系情境导入探索新知例题辨析巩固练习归纳总结布置作业利用单位圆,可以求得并且即对任意角α,是否仍有这样的关系呢?4.4同角三角函数的基本关系情境导入探索新知例题辨析巩固练习归纳总结布置作业一般地,设点P(x,y)是角α的终边与单位圆O的交点,则|OP|=1,x=cosα,y=sinα.因为,所以x²+y²=1即sin²α+cos²α=1显然,当α的终边与坐标轴重合时,这个公式也成立.4.4同角三角函数的基本关系情境导入探索新知例题辨析巩固练习归纳总结...
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