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-1/8 ≤ cosα cosβ cosγ ≤ 1
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
異分母分數減法
柱體建築師
四邊形的特性
三位數除以一位數（一）
錐體建築師
Discover Resources
平行四邊形面積教材四
邊長與三角形 數學教室(1/4)
過圓內一點與圓相切的圓
平移法（二）
Copy of 製作組織圖
Discover Topics
Vectors 3D (Three-Dimensional)
Vectors
Cosine
Curve Sketching
Circumcircle or Circumscribed Circle