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计算:tan60°+2sin45°-2cos30°的结果是( )
A.2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857010_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857010_ST/1.png)
D.1
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在Rt△ABC中,∠C=90°,若AB=2AC,则cosA的值等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857009_ST/2.png)
D.
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在-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857008_ST/0.png)
,0.168,π,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857008_ST/1.png)
,sin60°中,无理数的个数是( )
A.1
B.2
C.3
D.4
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在Rt△ABC中,∠C=90°,如果cosB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857007_ST/0.png)
,那么sinA的值是( )
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857007_ST/2.png)
D.
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在Rt△ABC中,∠C=90°,如果AB=2,BC=1,那么sinA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101402571385700/SYS201311031014025713857006_ST/2.png)
D.
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