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△ABC中,已知:,且,则的值是( ) A.2 B. C.-2 D.
△ABC中,已知:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845005_ST/0.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845005_ST/1.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845005_ST/2.png)
的值是( )
A.2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845005_ST/3.png)
C.-2
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845005_ST/4.png)
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