题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052405-42907.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052405-33746.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052405-15553.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052405-25718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-94393.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-49018.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-14534.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-59027.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-24592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-83645.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-68973.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052407-70093.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052407-73442.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-94393.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052407-18385.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052407-79381.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052408-35764.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052408-79675.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052408-95732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052408-52106.gif)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-14534.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052408-27449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052408-52106.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052409-41410.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052409-90501.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052406-59027.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052409-92099.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052409-36659.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052410-92896.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052410-68981.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052359-51771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052400-87311.gif)
(参考数据:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052400-76331.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052355-55789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052355-19644.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052355-60867.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052356-39658.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052348-53798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052348-63310.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052348-38423.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052349-68522.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052349-88663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052349-36859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052349-59833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052348-53798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052349-62645.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052349-88663.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052350-89242.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052341-56210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052341-80391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052342-62624.png)
(1)求角C;
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052341-56210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020052336-21533.gif)
(Ⅰ)求B的大小;
(Ⅱ)求cosA+sinC的取值范围。
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