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在△ABC中,∠C=90°,a,b分别是∠A,∠B所对的两条直角边,c是斜边,则...
在△ABC中,∠C=90°,a,b分别是∠A,∠B所对的两条直角边,c是斜边,则有( )
A.sinA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187023_ST/0.png)
B.cosB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187023_ST/1.png)
C.tanA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187023_ST/2.png)
D.cotB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187023_ST/3.png)
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若△ABC在正方形网格纸中的位置如图所示,则tanα的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187022_ST/0.png)
B.
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C.
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D.1
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在△ABC中,已知AC=3,BC=4,AB=5,那么下列结论成立的是( )
A.sinA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187021_ST/0.png)
B.cosA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187021_ST/1.png)
C.tanA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187021_ST/2.png)
D.cotA=
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如图,菱形ABCD的对角线AC=6,BD=8,∠ABD=α,则下列结论正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187020_ST/images0.png)
A.sinα=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187020_ST/0.png)
B.cosα=
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C.tanα=
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D.tanα=
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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.
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在△ABC中,∠C=90°,如果tanA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187018_ST/0.png)
,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.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187018_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101451695418710/SYS201311031014516954187018_ST/3.png)
D.
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