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Author:
whlee1990
GeoGebra
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百分數及其應用
盈利與虧蝕
双心四边形
折扣
斐波那契螺旋弧线（表格法）
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雙曲線之極偶 / polarity for hyperbola
Apollonius Problem 6 CLP Inversion 0
Tangent to a curve at a point
平面截距式的副本
勾股定理：射影无字证明
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Curve Sketching
Translation
Parabola
Differential Calculus
Special Points