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Roger Test Draw
Author:
rogerp
Test draw of 2nd degree polynomial, ver2
GeoGebra
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盈利與虧蝕
三角函数 的副本
撒针估算面积实验
科氏力 (Coriolis Force)
常见四边形是否是双心四边形
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中線
arccot 的導數
圖形2
內心
一道三视图的题目（三视图作法参考）
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Coordinates
Cosine
Addition
Logarithm
Statistics