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三角函數sine跟cosine
Author:
JUNWAYLIANG
GeoGebra
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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
拼砌四邊形
三位數除以一位數（二）
畫出對稱圖形
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立體圖
waaachen
台球反射
拋物線3--平行四邊形法
高中数学-复数-自测、自练实验
Discover Topics
Square
Tangent Line or Tangent
Natural Numbers
Conditional Probability
Poisson Distribution