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教学素材：正切函数及其反函数
Author:
清风拂琴，陌上花开
GeoGebra
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双心四边形
盈利與虧蝕
龙形曲线-分形龙
科赫雪花
正方形雪花图案
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簡易機率
Building Cones 建造圓錐體
gsx-a01-06 數線上的點
中垂線性質
test
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Multiplication
Straight Lines
Incircle or Inscribed Circle
Parallelogram
Reflection