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(2006•宿迁)如图,在Rt△ABC中,∠C=90°,AC=3,AB=5.则c...
(2006•宿迁)如图,在Rt△ABC中,∠C=90°,AC=3,AB=5.则cosB等于( )
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A.
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230735194105981/SYS201310212307351941059005_ST/1.png)
C.
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D.
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