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已知角α的终边与单位圆的交点为,则tanα=( ) A. B. C. D.
已知角α的终边与单位圆的交点为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223300337817795/SYS201311012233003378177002_ST/0.png)
,则tanα=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223300337817795/SYS201311012233003378177002_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223300337817795/SYS201311012233003378177002_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223300337817795/SYS201311012233003378177002_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223300337817795/SYS201311012233003378177002_ST/4.png)
考点分析:
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,且
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,则x等于( )
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B.
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D.
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B.-120°
C.240°
D.-240°
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