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Author:
Keung
GeoGebra
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三角函数 的副本
活动三：应用性质
圓的切線方程
龙形曲线-分形龙
撒针估算面积实验
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Question 2
七巧板（tangram）的副本
Copy of 銳角三角：sin, cos
Protractor-usage
一次函数图像的平移
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Derivative
Polygons
Rotation
Upper and Lower Sum or Riemann Sum
Arithmetic