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tanx & cotx
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denisjelly
GeoGebra
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百分數及其應用
平行線的判定
盈利與虧蝕
折扣
龙形曲线-分形龙
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waaachen
過圓內C點的弦中點軌跡
斯坦納-雷米歐司(Steiner-Lehmus)定理推廣
Copy of 3S2 01a 平行四邊形 20151207
中國火柴遊戲一的副本
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Ellipse
Special Points
Continuity
Secant Line or Secant
Orthocenter