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如果角θ的终边过点P(a,3a)(a≠0),则sinθ的值为( ) A. B. ...
如果角θ的终边过点P(a,3a)(a≠0),则sinθ的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906681161153/SYS201311012229066811611003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906681161153/SYS201311012229066811611003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906681161153/SYS201311012229066811611003_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906681161153/SYS201311012229066811611003_ST/3.png)
考点分析:
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设
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、
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、
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是单位向量,则下列命题中正确的 是( )
A.|
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|=|
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|=|
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B.
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=
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=
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C.
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•
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•
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=1
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906681161153/SYS201311012229066811611002_ST/12.png)
、
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是共线向量
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906681161153/SYS201311012229066811611001_ST/1.png)
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如图,直三棱柱ABC-A
1B
1C
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