如图在中，AB=AC，过点A的直线与的外接圆交于点P，交BC的延长线于点

如图在中，AB=AC，过点A的直线与的外接圆交于点P，交BC的延长线于点D.求证

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如图在中，AB=AC，过点A的直线与的外接圆交于点P，交BC的延长线于点

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