(2010•攀枝花)如图所示,已知AB是⊙O的直径,直线L与⊙O相切于点C,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230527557382877/SYS201310212305275573828020_ST/0.png)
,CD交AB于E,BF⊥直线L,垂足为F,BF交⊙O于C.
(1)图中哪条线段与AE相等?试证明你的结论;
(2)若
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230527557382877/SYS201310212305275573828020_ST/1.png)
,AE=4,求AB的值.
考点分析:
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