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StandingWaves
Author:
ken@ylshsap
GeoGebra
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活动三：应用性质
三角函数 的副本
斐波那契螺旋弧线（表格法-可动态调节）
中华人民共和国国旗
龙形曲线-分形龙2
Discover Resources
Venn diagram
Platonic Solids 柏拉圖立體
test
Copy of 劉徽的「割圓術」
橢圓的副本
Discover Topics
Differential Calculus
Fractions
Cuboid
Upper and Lower Sum or Riemann Sum
Planes