题目
题型:不详难度:来源:
设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070654-61313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070654-21088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070654-43696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070654-65424.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070654-57123.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070654-88282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-77328.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-75627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-33319.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070654-65424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-73912.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-71314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-29224.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-66036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-77618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-75627.png)
(Ⅱ)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-21278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070656-35193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070656-79087.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-77328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070656-75049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-77328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070655-33319.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070646-35855.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070646-67317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070646-70870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070646-67317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070646-67317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070647-28398.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070637-76435.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070637-42852.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070637-38546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070638-45646.gif)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070638-39837.gif)
(2)设向量
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070638-84373.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070638-16549.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070638-64522.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070632-19022.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070632-91461.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070633-70671.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070626-82732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070626-65741.gif)
(1)用
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070626-24506.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070626-70179.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-87216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070621-25461.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070621-23262.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070621-45752.gif)
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