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Author:
cktsang
permutation (chi. ver.)
GeoGebra
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圓的切線方程
漂亮的摇摆曲线
兩位數除以一位數（二）
直線的斜率
兩位數除以一位數（一）
Discover Resources
花瓣曲線
Projection of vector in R2
Bearings
數據分析（1）
图形的放大与缩小.许兴华数学
Discover Topics
Stochastic Process or Random Process
Means
Linear Programming or Linear Optimization
Vectors 3D (Three-Dimensional)
Cone