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因為P是弦的點 所以OP恆垂直於PA 所以P點的軌跡在以OA為直徑的圓上 該圓的圓心坐標是(1/2,1),半徑為R,R²=(1²+2²)/4=5/4 所以P的軌跡方程為:(x-(1/2))²+(y-1)²=5/4
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