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在Rt△ABC中,∠C=90°,BC=4,AC=3,则tanA的值是( ) A....
在Rt△ABC中,∠C=90°,BC=4,AC=3,则tanA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249021_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249021_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249021_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249021_ST/3.png)
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在正方形网格中,△ABC位置如图所示,则tan∠ABC的值为( )
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A.1
B.
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C.
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在△ABC中,∠C=90°,AB=2,BC=1,那么cosB的值是( )
A.
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B.
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C.
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D.
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在Rt△ABC中,∠C=90°,a、b、c分别是∠A、∠B、∠C的对边,下列等式中,正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187026_ST/0.png)
B.
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C.
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D.
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已知Rt△ABC中,∠C=90°,tanA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187025_ST/0.png)
,BC=8,则AC等于( )
A.6
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187025_ST/1.png)
C.10
D.12
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