题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041406-25214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041406-99579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041406-82208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041407-20750.png)
答案
解析
试题分析:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041406-25214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041407-97730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041406-82208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041406-25214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041407-12093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041407-55235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041408-96921.png)
点评:熟练掌握两角和差公式及二倍角公式是解决此类问题的关键,属基础题
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041356-57074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041356-98186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041356-20795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041357-74949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041357-71730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041357-60882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041357-27026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041357-64870.png)
(1)求A的大小;
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041358-40475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041347-59070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041348-86157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041348-10424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041348-80140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041348-10990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041348-57276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041349-68630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041349-88729.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041349-88729.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041349-56604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041349-88689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041347-59070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041340-84554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041341-86391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041340-84554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041341-67747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041341-19901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041341-69478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041342-83186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041340-84554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041341-86391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041342-63781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041342-95296.jpg)
如图所示,港口
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041333-29957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041334-66220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041334-64295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041334-26427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041334-98184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041335-66814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041334-26427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041335-83340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041335-78366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041335-15933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041335-38912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041333-29957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041336-13046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041330-92454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041330-90389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020041330-13181.png)
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