题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162650-19712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162650-42813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162651-46126.png)
A.![]() | B.4 | C.![]() | D.2 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162650-19712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162651-75087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162652-81435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162652-94582.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162652-64394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162651-46126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162652-35251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162652-17542.png)
另在△ABC中
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162650-42813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162652-64394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162653-94314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162653-26566.png)
由①②③得
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162653-47484.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162622-10242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162622-75462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162622-85810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162623-71315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162623-55903.png)
(1) 若sin
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162550-10249.png)
(2) 若cosA=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162551-61211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162539-39044.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162540-41490.png)
(2)在△ABC中,角A、B、C的对边分别是a,b,c,且满足
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162540-36945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162540-66758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162505-20353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162506-81281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162506-94124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162505-20353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162506-81281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162506-94124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162506-14621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162446-19570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019162447-11350.png)
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