题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145628-52785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145628-50957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145628-86855.png)
(I)求角C;
(II)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145628-16822.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145629-98954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145629-68842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145629-19796.png)
解析
试题分析:解(I)由已知
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145628-86855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145629-69955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145630-40077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145630-42854.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145630-98562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145630-64766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145630-75621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145631-69692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145629-98954.png)
(II)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145631-30244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145631-63697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145631-61162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145632-46157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145632-32934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145632-94217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145632-31004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145632-30736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145633-43696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145633-17217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145629-68842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145632-31004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145633-43696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145633-91606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145633-34023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145632-94217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145629-68842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145629-19796.png)
点评:解决的关键是利用正弦定理得到边角化简,然后结合恒等变换来得到单一三角函数,进而求解其性质,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145611-87187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145612-80771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145612-46565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145612-13309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145612-43249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145502-31241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145503-74329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145503-51416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145456-84878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145456-20590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145456-31364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145456-88252.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145456-97331.png)
(2)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145457-61027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145457-40219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145358-71793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145358-32121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145358-97035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145358-71793.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145346-63780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145347-10114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145347-12622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145347-71879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145347-63730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145347-89767.png)
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