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如图,在Rt△ABC中,∠ACB=90°,BC=1,AB=2,则下列结论正确的是...
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如图,在Rt△ABC中,∠ACB=90°,BC=1,AB=2,则下列结论正确的是( )
A.sinA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571234217/SYS201311031014025712342018_ST/0.png)
B.tanA=
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C.cosB=
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D.tanB=
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在Rt△ABC中,∠C=90°,若sinA=
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,则∠A的度数是( )
A.60°
B.45°
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下列运算正确的是( )
A.2ab
2-ab
2=1
B.tan45°•sin45°=1
C.x
2•x=x
3D.(a
2)
3=a
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在等腰直角三角形ABC中,∠C=90°,则sinA等于( )
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如图所示,正方形ABCD中,对角线AC、BD交于点O,点M、N分别为OB、OC的中点,则cos∠OMN的值为( )
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