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在Rt△ABC中,∠C=90°,a=4,b=3,则sinA的值是( ) A. B...
在Rt△ABC中,∠C=90°,a=4,b=3,则sinA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187019_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187019_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187019_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187019_ST/3.png)
考点分析:
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在△ABC中,∠C=90°,如果tanA=
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,那么sinB的值等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187018_ST/1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187018_ST/3.png)
D.
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在Rt△ABC中,CD是斜边AB上的高线,已知∠ACD的正弦值是
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,则
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的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187017_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187017_ST/3.png)
C.
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D.
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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( )
A.sinB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187016_ST/0.png)
B.cosB=
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C.tanB=2
D.cotB=
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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/20131103101451695418710/SYS201311031014516954187015_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187015_ST/0.png)
B.
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C.
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D.
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三角形在正方形网格纸中的位置如图所示.则sinα的值是( )
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A.
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B.
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C.
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D.
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