题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102741-82248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102742-14235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102742-94091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102742-74270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102742-75930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102743-62560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102743-79690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102743-34392.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102743-45851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102743-17654.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102742-94091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102742-74270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102744-79340.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-66199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-82670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-78476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-39579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102727-18667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102727-89214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102719-87132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102719-73940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-86246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-89757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-76555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-71259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-93486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102721-58848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102714-74688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102714-49464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102714-35274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102714-39987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102715-42970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102715-71415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-25954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-56504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-56852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-61880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-50702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-18063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-35190.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-55224.png)
(2)当锐角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-61880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-55224.png)
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