11题。thanks.teacher.
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/25 13:04:17
![](http://img.wesiedu.com/upload/c/98/c9857b1df89d01d7a7931dba14b4cc0c.jpg)
![11题。thanks.teacher.](/uploads/image/z/6898008-48-8.jpg?t=11%E9%A2%98%E3%80%82thanks.teacher.)
解题思路: (1)对所给的条件平方后,结合同角三角函数的基本关系式来求;(2)在(1)的基础上,结合二倍角公式来求值.
解题过程:
![](http://img.wesiedu.com/upload/5/3b/53b8290817fe276a800676875281e9c0.jpg)
解题过程:
![](http://img.wesiedu.com/upload/5/3b/53b8290817fe276a800676875281e9c0.jpg)
11题。thanks.teacher.
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