如图,EP交圆于E、C两点,PD切圆于D,G为CE上一点且,连接DG并延长交

如图,EP交圆于EC两点,PD切圆于DGCE上一点且,连接DG并延长交圆于点A,作弦AB垂直EP,垂足为F.

1)求证:AB为圆的直径;

2)若AC=BD,求证:AB=ED.

答案

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