题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083504-38954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083504-50595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083505-73664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083504-38954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083505-73664.png)
(I)求f(x)的最小正周期与单调递增区间;
(Ⅱ)在△ABC中,a,b,c分别是角A,B,C的对边,若A=
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083504-50595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083505-91242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083505-53407.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083505-19701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083506-21043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083506-10341.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083506-92857.png)
解析
试题分析:解:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083507-17835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083507-95329.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083506-21043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083505-19701.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083507-77775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083508-64120.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083506-21043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083506-10341.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083508-88287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083508-42844.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083508-95895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083509-56615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083506-92857.png)
点评:主要是考查了结合向量的数量积公式来化简三角函数关系式,然后借助于三角函数的性质来得到求解,属于基础题。
核心考点
试题【已知向量=(sin2x+2,cosx),=(1,2cosx),设函数f(x)= ·.(I)求f(x)的最小正周期与单调递增区间;(Ⅱ)在△ABC中,a,b,c分】;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/20190910/20190910083444-86383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083444-75197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083444-58576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083444-86383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083444-58576.png)
(I)求f(x)的最小正周期与单调递增区间;
(Ⅱ)在△ABC中,a,b,c分别是角A,B,C的对边,若a=
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083444-75197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083437-81502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083438-82100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083438-55862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083438-25527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083438-84596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083439-10525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083439-93044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083439-87712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083433-43927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083434-41103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083310-35803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083311-60806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083311-48525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083311-31236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083311-33994.png)
函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083312-85534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083312-18086.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083312-71902.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083312-85534.png)
(3)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083312-37786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083313-38971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083313-38971.png)
相应的
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083313-60710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083252-68592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083253-98662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910083253-72055.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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