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設p點坐標為(x,y) 則p到F的距離為 Sqrt[(x - 2)^2 - y^2] 到直線的距離為x-8 由題意可知Sqrt[(x - 2)^2 - y^2]=2x-8 即(x-2)^2-y^2=4(x-8)^2 整理就可得軌跡方程
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