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在Rt△ABC中,若∠C=90°,AC=1,BC=2,则下列结论中正确的是( )...
在Rt△ABC中,若∠C=90°,AC=1,BC=2,则下列结论中正确的是( )
A.sinB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662025_ST/0.png)
B.cosB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662025_ST/1.png)
C.tanB=2
D.cotB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662025_ST/2.png)
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如图,tanα等于( )
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A.
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B.2
C.
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D.
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在Rt△ABC中,∠C=90°,cosA=
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,则tanA=( )
A.
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B.
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C.
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D.24
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如图,在△ABC中,AC=3,BC=4,AB=5,则tanB的值是( )
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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根据图中信息,经过估算,下列数值与tanα的值最接近的是( )
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A.0.3640
B.0.8970
C.0.4590
D.2.1785
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