(2008•岳阳)如图,⊙O是△ABC的外接圆,BD为圆O的直径,AB=AC,AD交BC于E,ED=2AE.
(1)求证:AB2=AD•AE;
(2)求∠ADB的度数;
(3)延长DB到F,使BF=BO,连接FA.求证:直线FA为⊙O的切线.
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