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下面有四个命题: ①终边在y轴上的角的集合是{α|}; ②在同一坐标系中,函数y...
下面有四个命题:
①终边在y轴上的角的集合是{α|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224335991392202/SYS201311012243359913922006_ST/0.png)
};
②在同一坐标系中,函数y=sinx和函数y=x的图象有三个公共点;
③把
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224335991392202/SYS201311012243359913922006_ST/1.png)
的图象向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224335991392202/SYS201311012243359913922006_ST/2.png)
得到y=3sin2x的图象;
④函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224335991392202/SYS201311012243359913922006_ST/3.png)
在[0,π]上是减函数.
其中真命题的个数是( )
A.1
B.2
C.3
D.4
考点分析:
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