题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122221-56871.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122221-45117.png)
(2)设A,B,C为
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122221-47757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122221-50647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122222-14664.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122222-38824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122222-97543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122222-11678.png)
解析
试题分析:(1)用两角和差公式、二倍角公式和化一公式将函数
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122223-59775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122223-96304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122223-42170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122223-47406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122223-59775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122221-50647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122223-46782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122224-76128.png)
试题解析:
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122221-56871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122224-95749.png)
(1)函数
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122221-45117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122222-38824.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122224-51414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122224-73918.png)
∴函数f(x)的单调递增区间为
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122222-97543.png)
(2)由已知
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122224-98794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122225-19264.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122225-43875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122225-62162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122225-25717.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122225-60882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122226-25238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122222-11678.png)
核心考点
试题【设函数(1)求函数的周期和单调递增区间;(2)设A,B,C为ABC的三个内角,若AB=1, ,,求s1nB的值.】;主要考察你对正弦函数的图象与性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122206-96957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122149-51639.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122133-10084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122133-81474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122133-10084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122133-81474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122133-10084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122133-81474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122134-46025.png)
A.y=f(x)在(0,![]() |
B.y=f(x)在(![]() ![]() |
C.y=f(x)在(0,![]() |
D.y=f(x)在(![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122126-84449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122126-84449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122126-46023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122126-62599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122127-73262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901122126-84449.png)
A.[![]() ![]() |
B.[![]() ![]() |
C.[0,![]() |
D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901121857-85499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901121857-75088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901121858-93094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901121858-92719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901121858-89086.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
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