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点的轨迹
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GeoGebra
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正方形雪花图案
双心四边形
祖冲之的期望：内棋与外棋
盈利與虧蝕
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Heat Sink Fin
gjh-h04-01 多個堆疊的直角三角形
中研院數學所
圆柱截方
橢圓的副本
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Unit Circle
Sine
Conic Sections
Median Line
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