题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005417-21345.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005417-16818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005417-16818.png)
(2)已知
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005417-70067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-32969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-90422.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-61010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-16887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-63676.png)
解析
试题分析:(1)根据函数的图象确定得到
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-61010.png)
结合图象可得
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005419-76160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-16887.png)
(2)由(1)可知
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005419-86168.png)
根据角
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005419-34371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005419-13596.png)
进一步应用三角函数诱导公式、同角公式、两角和差的三角函数公式即可得解.
(1)由周期
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005420-14207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005420-57127.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005420-87194.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005420-11839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005421-96663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005421-24482.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005421-47217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005421-44669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-61010.png)
由图象可得
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005419-76160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005418-16887.png)
(2)由(1)可知,
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005422-80874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005419-86168.png)
又角
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005419-34371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005419-13596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005422-52598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005422-97347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005422-83576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005422-47312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005423-78870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005423-57156.png)
核心考点
试题【已知函数的部分图象如图所示.(1)求函数的解析式,并写出 的单调减区间;(2)已知的内角分别是A,B,C,角A为锐角,且的值.】;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/20190830/20190830005411-26818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005411-81649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005411-12128.png)
(1)求函数的表达式及单调递增区间;
(2)在△ABC中,a,b,c分别是角A,B,C的对边,S△ABC为其面积,若
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005412-91878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005412-64759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830005405-28803.png)
A.f(x)的图象关于直线x=![]() |
B.f(x)的图象关于点(![]() |
C.f(x)的最小正周期为π,且在[0,![]() |
D.把f(x)的图象向右平移![]() |
①若cos α=cos β,则α-β=2kπ,k∈Z;
②函数y=2cos
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004326-73579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004326-84808.png)
③函数y=cos(sin x)(x∈R)为偶函数;
④函数y=sin|x|是周期函数,且周期为2π.
A.①② | B.①④ | C.①②③ | D.①②④ |
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004311-86286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004312-43208.png)
②存在区间(a,b)使y=cos x为减函数且sin x<0;
③y=tan x在其定义域内为增函数;
④y=cos 2x+sin(
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004311-86286.png)
⑤y=|sin 2x+
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004312-44878.png)
以上命题错误的为________(填序号).
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004305-23275.png)
(1)求函数f(x)的最小正周期T及单调递增区间;
(2)已知a,b,c分别为△ABC内角A,B,C的对边,A为锐角,a=2
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004305-56945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830004305-83733.png)
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