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正方形网格中,∠AOB如图放置,则sin∠AOB=( ) A. B. C. D....
正方形网格中,∠AOB如图放置,则sin∠AOB=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962020_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962020_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962020_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962020_ST/2.png)
D.2
考点分析:
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A.
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B.
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C.
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D.
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在△ABC中,∠C=90°,tanA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962018_ST/0.png)
,则sinB=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962018_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962018_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962018_ST/3.png)
D.
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在Rt△ABC中,∠C=90°,AB=4,BC=1,则cosA的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962017_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962017_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962017_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962017_ST/2.png)
D.4
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已知△ABC中,AC=4,BC=3,AB=5,则sinA=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962016_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962016_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962016_ST/2.png)
D.
查看答案
如图,在Rt△ABC中,tanB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962015_ST/0.png)
,BC=2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962015_ST/1.png)
,则AC等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962015_ST/images2.png)
A.3
B.4
C.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570596262/SYS201311031014025705962015_ST/2.png)
D.6
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