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(2006•攀枝花)如图所示,AB是⊙O的直径,弦AC,BD相交于E,则等于( ...
(2006•攀枝花)如图所示,AB是⊙O的直径,弦AC,BD相交于E,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110301275022301/SYS201310191103012750223009_ST/0.png)
等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110301275022301/SYS201310191103012750223009_ST/images1.png)
A.tan∠AED
B.cot∠AED
C.sin∠AED
D.cos∠AED
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