题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144217-24715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144217-85539.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144217-43178.png)
(2)已知
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144218-64109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144218-40647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144218-79742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144218-76669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144218-57859.png)
求
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144218-64109.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144219-55831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144219-86033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144219-55655.png)
解析
试题分析:(1)由函数
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144217-85539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144217-24715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144219-17829.png)
(2)通过解三角方程,可求得角A的值,再结合三角形的余弦定理以及已知条件可得
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144219-64872.png)
试题解析:(1)依题意,得
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144220-97636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144220-98016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144220-38960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144217-43178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144219-55831.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144220-97966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144221-88288.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144217-43178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144219-86033.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144218-76669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144221-66337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144221-71922.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144221-19868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144222-37941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144222-22988.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144222-86692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144222-52924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144218-57859.png)
∴根据余弦定理得,
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144223-84035.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144223-64497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144223-18375.png)
核心考点
试题【已知向量,函数.(1)求函数的最小正周期及单调递增区间;(2)已知中,角的对边分别为,若,,求的面积.】;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/20190901/20190901144016-56158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144017-29826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144017-26885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901144012-75786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124639-59399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124639-98709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124639-64353.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124639-87920.png)
(2)已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124640-79883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124640-81288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124600-53817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124601-10290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124601-10625.png)
A.最小正周期为![]() | B.最小正周期为![]() |
C.最小正周期为![]() | D.最小正周期为![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124432-34419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190901/20190901124432-63263.png)
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