题目
题型:不详难度:来源:
![](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)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-61630.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-87216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-17914.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070626-82732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-86598.gif)
由正弦定得,得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-40028.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070628-10003.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-61630.gif)
(2)由(1)得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-87216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070628-34641.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070626-70179.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070628-83583.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070628-28972.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070629-90936.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070629-42435.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-87216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070627-17914.gif)
核心考点
举一反三
![](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)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070615-60764.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070616-60927.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070615-60764.gif)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070610-13921.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070603-48793.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070603-94962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070603-92878.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070604-21827.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070604-20855.gif)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070604-96828.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070604-27954.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070604-48591.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070604-91533.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070556-23130.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070557-73180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070557-35433.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070557-65364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070557-89321.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070558-35336.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070558-97741.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
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