若α是第二象限角,其终边上一点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238007_ST/0.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238007_ST/1.png)
,则sinα=
.
考点分析:
相关试题推荐
设集合M={α|α=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238006_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238006_ST/1.png)
,k∈Z},N={α|-π<α<π},则M∩N=
.
查看答案
如图所示,设点A是单位圆内的一定点,动点P从点A出发在圆上按逆时针方向旋转一周,点P所旋转过的弧
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238005_ST/0.png)
的长为l,原点O到弦AP的长为d,则函数d=f(l)的图象大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238005_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238005_ST/images2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238005_ST/images3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238005_ST/images4.png)
D.
查看答案
已知角2α的顶点在原点,始边与x轴的非负半轴重合,终边经过点(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238004_ST/0.png)
),且2α∈[0,2π),则tanα等于( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238004_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238004_ST/2.png)
C.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238004_ST/3.png)
D.
查看答案
将表的分针拨慢10分钟,则分针转过的角的弧度数是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238003_ST/1.png)
C.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238003_ST/2.png)
D.-
查看答案
△ABC中,若sinA<cosB,则△ABC为( )
A.锐角三角形
B.直角三角形
C.钝角三角形
D.不能确定
查看答案