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生日问题1
Author:
徐晓东
GeoGebra
New Resources
垂直線的斜率
球体的体积推导（优化版）
圓的切線方程
直線的斜率
斜率的值
Discover Resources
陳柄何的GGB book
Fundamental theorem of curves
認識y是x的函數圖形
創作一個相同周界的封閉平面圖形
Trigonometric Relations(180,360)
廣義角的副本
Discover Topics
Quadratic Functions
Step Functions
Ellipse
Isosceles Triangles
Calculus