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在Rt△ABC中,∠C=90°,cosA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662023_ST/0.png)
,则tanA=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662023_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662023_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662023_ST/3.png)
D.24
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如图,在△ABC中,AC=3,BC=4,AB=5,则tanB的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662022_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662022_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662022_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662022_ST/2.png)
D.
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如图,CD是Rt△ABC斜边上的高,AC=4,BC=3,则cos∠BCD的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662021_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662021_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662021_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662021_ST/2.png)
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( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662020_ST/images0.png)
A.0.3640
B.0.8970
C.0.4590
D.2.1785
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已知Rt△ABC中,∠C=90°,AC=2,BC=3,那么下列各式中,正确的是( )
A.sinB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662019_ST/0.png)
B.cosB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662019_ST/1.png)
C.tanB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662019_ST/2.png)
D.cotB=
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