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waaachen
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陳兪宏
與雙曲線相切圓半徑證明
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dandelin
分角线
Aire Cercle 的副本
Waves
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認識函數
Building Cones 建造圓錐體
潘研02
對數圖形
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Derivative
Linear Functions
Difference and Slope
Bar Chart or Bar Graph
Plane Figures or Shapes