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已知,则cos(α+3π)的值等于( ) A. B. C. D.
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222712476573977/SYS201311012227124765739002_ST/0.png)
,则cos(α+3π)的值等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222712476573977/SYS201311012227124765739002_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222712476573977/SYS201311012227124765739002_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222712476573977/SYS201311012227124765739002_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222712476573977/SYS201311012227124765739002_ST/4.png)
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