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在Rt△ABC中,∠C=90°,AC=3,BC=4,则sinA的值是( ) A....
在Rt△ABC中,∠C=90°,AC=3,BC=4,则sinA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662006_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662006_ST/3.png)
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在Rt△ABC中,∠C=90°,下列式子不一定成立的是( )
A.sinA=cosB
B.sinB=cosA
C.tanA=tanB
D.sin
2A+sin
2B=1
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在△ABC中,∠C=90°,BC=2,sinA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662004_ST/0.png)
,则边AC的长是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662004_ST/1.png)
B.3
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662004_ST/2.png)
D.
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在△ABC中,∠C=90°,AB=13,BC=12,则sinB的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662003_ST/2.png)
D.
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在Rt△ABC中,∠C=90°,b=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662002_ST/0.png)
c,则sinB的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662002_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662002_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662002_ST/3.png)
D.
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如图,在直角△ABC中,∠C=90°,若AB=5,AC=4,则sinB=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662001_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662001_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662001_ST/2.png)
D.
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