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-1/8 ≤ cosα cosβ cosγ ≤ 1
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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兩位數除以一位數（一）
画直线等分三角形的面积
拼砌四邊形
畫出對稱圖形
球體建築師
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三角形與邊上一點求正三角形
三個函數的最小值的最大值
大邊對大角
Heidi Lin - Conic Section
箭头平移
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Root
Circumcircle or Circumscribed Circle
Hypothesis Testing
Poisson Distribution
Random Experiments