题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-17828.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-23560.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-96036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-67220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-36170.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-23560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-81133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-24844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-55756.png)
解析
试题分析:(1)利用三角函数的和差倍半公式,首先化简函数,得到
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-67711.png)
明确最小正周期
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-16972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-81133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-24844.png)
(Ⅱ)依题意
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-67711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-67220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032408-26251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-55756.png)
本题较为典型,注意角的范围.
试题解析:
(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032408-81646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032408-99182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-67711.png)
所以,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-23560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-81133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-24844.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-67220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032408-26251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032406-96036.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032408-31256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032409-41729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032407-55756.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032400-50441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032400-28506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032401-42458.png)
A.1 | B.![]() | C.2 | D.2![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032350-28236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032350-77430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032350-63604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032350-96432.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032351-99907.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032351-58222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032351-69698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032343-96588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032343-94424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032343-79796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032343-57897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032343-19613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032343-19613.png)
A.等腰三角形 | B.等边三角形 | C.直角三角形 | D.等腰直角三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032333-26207.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032333-28729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032333-50617.png)
(Ⅱ)△ABC中,角A,B,C的对边为a,b,c,若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032333-91617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032333-13849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032322-73283.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032323-94553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032323-92436.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032323-13084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032323-23883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032322-73283.png)
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