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在Rt△ABC中,∠C=90°,AB=4,BC=1,则cosA的值是( ) A....
在Rt△ABC中,∠C=90°,AB=4,BC=1,则cosA的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962017_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962017_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962017_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962017_ST/2.png)
D.4
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