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三角函数线
Author:
冯伟冀
Topic:
Trigonometry
GeoGebra
New Resources
算柱 (兩位數)
異分母分數減法
拼砌四邊形
球体的体积推导（优化版）
四邉形 (四年級) 教師版
Discover Resources
黎曼和
三平行線上作正三角形
圓柱截痕
Pokemon quiz (daliy)
四面體 ABCD, AB 與 CD 距離
Discover Topics
Circle
Incircle or Inscribed Circle
Hypothesis Testing
Perimeter
Constructions