如图1,在平面直角坐标系中,圆o 1交x轴于A、B ,交y轴正半轴于C,CD平行AB交圆O1于D(1)判断四边形ABCD的形状并证明;(2)如图2,若A(4,0)、B(-3,0),且以OC为直径的半⊙O2于AD相切于E,求点C的坐
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