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在△ABC中,∠C=90°,BC=3,AB=4,则下列结论正确的是( ) A.s...
在△ABC中,∠C=90°,BC=3,AB=4,则下列结论正确的是( )
A.sinA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662017_ST/0.png)
B.cosA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662017_ST/1.png)
C.tanA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662017_ST/2.png)
D.cotA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402570766219/SYS201311031014025707662017_ST/3.png)
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在Rt△ABC中,∠C=90°,AB=5,AC=4,则cosB的值等于( )
A.
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B.
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C.
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D.
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在Rt△ABC中,∠C=90°,若AB=5,BC=3,则cosB=( )
A.
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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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D.
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在Rt△ABC中,∠C=90°,下列各式中正确的是( )
A.sinA=sinB
B.tanA=tanB
C.sinA=cosB
D.cosA=cosB
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