题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150000-90698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150001-62160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150001-15369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150002-44040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150000-90698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150002-66268.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150002-66268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150002-99662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150002-66268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150002-66268.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150002-10081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-98024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-46275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-84543.png)
(Ⅱ) 当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-49797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150004-47794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150004-18710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150004-14130.png)
解析
试题分析:(I)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150004-60150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150005-53937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150005-58045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150005-72992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-98024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-46275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-84543.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150005-90289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-98024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150006-12654.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150006-30706.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150006-20656.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150006-91862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150007-69360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150007-71445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150003-49797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150004-47794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150004-18710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019150004-14130.png)
点评:本题主要考查两角和与差的三角函数公式,三角函数的图象与性质,解三角形等基础知识;考查运算求解能力,考查函数方程思想、数形结合思想.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145955-37589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145956-58722.png)
A.105° | B.60° | C.15° | D.105°或15° |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145927-34964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145927-67004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145902-44802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145902-19685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145902-50276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145902-21006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145903-45306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145833-98471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145833-62983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145834-69471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145834-79420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145834-45095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145834-29699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145834-34242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145835-83018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145834-79420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145718-92704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145718-19552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145719-53342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145719-14107.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145719-94292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145719-66041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019145719-41756.png)
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