如图,AC是圆O的直径,AB=AC,BC交圆O于点D,AB交圆O于点E,过点D作DG⊥AB,垂足为G(1)求证:BD=CD(2)求证:DG为圆O的切线
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![如图,AC是圆O的直径,AB=AC,BC交圆O于点D,AB交圆O于点E,过点D作DG⊥AB,垂足为G(1)求证:BD=CD(2)求证:DG为圆O的切线](/uploads/image/z/7083860-68-0.jpg?t=%E5%A6%82%E5%9B%BE%2CAC%E6%98%AF%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84%2CAB%3DAC%2CBC%E4%BA%A4%E5%9C%86O%E4%BA%8E%E7%82%B9D%2CAB%E4%BA%A4%E5%9C%86O%E4%BA%8E%E7%82%B9E%2C%E8%BF%87%E7%82%B9D%E4%BD%9CDG%E2%8A%A5AB%2C%E5%9E%82%E8%B6%B3%E4%B8%BAG%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ABD%EF%BC%9DCD%EF%BC%882%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ADG%E4%B8%BA%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF)
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