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如图,延长Rt△ABC斜边AB到D点,使BD=AB,连接CD,若cot∠BCD=...
如图,延长Rt△ABC斜边AB到D点,使BD=AB,连接CD,若cot∠BCD=3,则tanA=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249007_ST/images0.png)
A.
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B.1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249007_ST/1.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249007_ST/2.png)
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A.
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B.
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D.
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如图,△ABC中,∠C=90°,AB=5,AC=3,则sinB=( )
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D.
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如图,在Rt△ABC中,∠CAB=90°,AD是∠CAB的平分线,tanB=
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如图,∠AOB=30°,过OA上到点O的距离为1,3,5,7,…的点作OA的垂线,分别与OB相交,得到如图所示的阴影梯形,它们的面积依次记为S
1,S
2,S
3,….则:
(1)S
1=
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(2)通过计算可得S
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