题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020739-93326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020739-36259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020739-55888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020739-59506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020739-78152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020740-63135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020740-22365.png)
⑴求角
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020739-93326.png)
⑵若
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020740-45764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020740-24399.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020741-10778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020741-98263.png)
解析
试题分析:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020741-46597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020741-87538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020741-74400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020742-68979.png)
再结合角
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020739-93326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020739-93326.png)
(2)利用同角三角函数基本关系中的平方关系
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020742-89560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020742-21462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020740-24399.png)
试题解析:⑴
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020742-28364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020742-10931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020743-29253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020743-89144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020743-59524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020743-22631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020743-66806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020743-87252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020741-10778.png)
⑵由题知
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020744-20301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020744-37752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020744-16047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020744-75151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020744-16001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020745-82853.png)
而
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020745-82853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020745-68478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020745-42260.png)
核心考点
试题【已知,,是三角形三内角,向量,,且.⑴求角;⑵若,求.】;主要考察你对同角三角函数的基本关系等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020717-11090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020717-71962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020718-91932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020718-75805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020718-77377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020718-57387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020719-92236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020652-93073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020653-61768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020650-94961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020650-39092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020650-57886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020642-67683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020643-13112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020643-39385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020618-68301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823020618-45445.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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