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角a终边过点P(-1,2),则sinα=( ) A. B. C. D.
角a终边过点P(-1,2),则sinα=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349781280581/SYS201311012313497812805002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349781280581/SYS201311012313497812805002_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349781280581/SYS201311012313497812805002_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349781280581/SYS201311012313497812805002_ST/3.png)
考点分析:
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B.x+y+1=0
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349781150676/SYS201311012313497811506019_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349781150676/SYS201311012313497811506018_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349781150676/SYS201311012313497811506018_ST/1.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349781150676/SYS201311012313497811506018_ST/2.png)
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