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高二上学期13周周三限时13.P(4,0),A、B是圆上两动点,满足∠APB=Π➗2,求矩形APBQ的顶点Q的轨迹方程

高二上学期13周周三限时13.P(4,0),A、B是圆上两动点,满足∠APB=Π➗2,求矩形APBQ的顶点Q的轨迹方程