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(2008•咸宁)在Rt△ABC中,∠C=90°,AB=4,BC=1,则cosA...
(2008•咸宁)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/20131021230834198653736/SYS201310212308341986537005_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230834198653736/SYS201310212308341986537005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230834198653736/SYS201310212308341986537005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230834198653736/SYS201310212308341986537005_ST/2.png)
D.4
考点分析:
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