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在Rt△ABC中,∠C=90°,AB=12,AC=5,则sinA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187012_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187012_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187012_ST/2.png)
D.
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在△ABC中,∠C=90°,AB=13,BC=12,则sinB的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187011_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187011_ST/2.png)
D.
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在正方形网格中,∠α的位置如图所示,则sinα的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187010_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187010_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187010_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187010_ST/2.png)
D.
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如图所示,Rt△ABC∽Rt△DEF,则cosE的值等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187009_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187009_ST/2.png)
D.
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如图,在Rt△ABC中,∠C=90°,三边分别为a,b,c,则cosA等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187008_ST/2.png)
D.
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