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九年级数学：C是y轴上一动点，当∠BCA=45°时，怎么求C点坐标？
九年级数学：C是y轴上一动点，当∠BCA=45°时，怎么求C点坐标？
初中数学，圆的计算和证明，垂径定理，圆周角圆心角，切线，扇形158/233
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