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-1/8 ≤ cosα cosβ cosγ ≤ 1
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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拼砌四邊形
兩組對邊相等的四邊形
兩位數加法
兩位數除以一位數（一）
画直线等分三角形的面积
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畢氏定理
y = sin(ωx)的圖像
Bearings(方位)
频率分布直方图与箱线图
生日问题
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Boxplot
Hypergeometric Distribution
Function Graph
Hypothesis Testing
Right Triangles