题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030817-46181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030817-17365.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030818-97396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030818-21506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030818-32212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030818-59435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030819-34452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030819-73073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030819-66183.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030819-85991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030819-89492.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030820-87039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030817-46181.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030820-33465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030820-23899.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030820-22211.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030819-73073.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030821-24472.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030819-66183.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030821-63505.png)
由题意可知,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030821-11085.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030821-68890.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030821-49180.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030822-80454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030822-69842.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030822-19057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030820-87039.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030822-60710.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030823-37048.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030823-20623.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030812-24169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030812-87969.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030804-75689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030805-46057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030805-18643.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030805-46057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030804-75689.png)
(2)当角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030804-75689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030805-46057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030805-46057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030758-12093.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
(1)求B.
(2)若sinAsinC=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030750-69257.png)
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