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sin.cos
Author:
19留家炫
GeoGebra
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空间中两直线的位置关系
垂直線的斜率
球体的体积推导（优化版）
漂亮的摇摆曲线
画直线等分三角形的面积
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平行四邊形面積
這是我的答案
fold and unflod the cone with geogebra5.0
除法運算
test007
Discover Topics
Symmetry
Cone
Scalene Triangles
Rotation
Plane Figures or Shapes