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如图,在△ABC中,∠A=30°,E为AC上一点,且AE:EC=3:1,EF⊥A...
如图,在△ABC中,∠A=30°,E为AC上一点,且AE:EC=3:1,EF⊥AB于F,连接FC,则tan∠CFB等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467010_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467010_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467010_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467010_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467010_ST/3.png)
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如图,Rt△ABC中,∠C=90°,D为BC上一点,∠DAC=30°,BD=2,AB=
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,则AC的长是( )
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A.
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B.
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C.3
D.
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在△ABC中,AB=AC=3,BC=2,则6cosB等于( )
A.3
B.2
C.
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D.
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如图,Rt△ABC中,∠ACB=90°,CD⊥AB于点D,BC=3,AC=4,设∠BCD=α,则tanα的值为( )
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A.
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B.
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C.
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D.
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如图,在菱形ABCD中,∠ABC=60°,AC=4,则BD的长为( )
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A.
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B.
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C.
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D.8
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如图,在Rt△ABC中,∠ACB=90°,CD⊥AB于D,AC=2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467005_ST/0.png)
,AB=2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467005_ST/1.png)
,设∠BCD=α,那么cosα的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467005_ST/images2.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467005_ST/2.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458204046704/SYS201311031014582040467005_ST/4.png)
D.
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