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IR-2
Author:
知己
GeoGebra
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三角函数 的副本
斐波那契螺旋弧线（表格法-可动态调节）
科赫雪花
异形操场
撒针估算面积实验
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正三角形的旋轉
角内切圆
ch14 p.30#31
改變橢圓的形狀
y=sinx描點
Discover Topics
Differential Calculus
Integral Calculus
Diagrams
Optimization Problems
Quadrilaterals