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(1999•广州)tan45°+tan30°=( ) A. B. C. D.
(1999•广州)tan45°+tan30°=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128013_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128013_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128013_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128013_ST/3.png)
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cos60°-
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sin45°=( )
A.
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B.-
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C.
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D.
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(1999•北京)在△ABC中,∠C=90°,如果sinA=
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,那么cotB的值等于( )
A.
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,则tanB=( )
A.1
B.
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C.
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,则tanB的值是( )
A.
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B.
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C.
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B.
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C.1
D.
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