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Equation of Locus of a Point Equidistant from Two Points 軌跡方程：與兩點保持等距

Autore:Alex CHIK
A和B為兩個城市。兩地政府打算興建一條公路。為公平起見，公路上的每一點P都與城市A和城市B保持相同距離(即PA=PB)。試移動粉紅色點找出公路的位置。
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