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Conics by a tangent circle

作者：John Golden
主題：橢圓, 雙曲線
Inspired by a gif from mathispun http://mathhombre.tumblr.com/post/69481899252/need-to-make-this Using a Jim Wilson construction http://jwilson.coe.uga.edu/EMAT6680Su06/Swanagan/Assignment7/BSAssignment7.html

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