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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
錐體建築師
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
判斷球體
直角坐標平面上的旋轉變換
Discover Resources
模擬3D---切割與展開
一般線性變換
S5 Normal Distribution
正切函數的絕對值圖形
纏繞畫
三角函数求值 （单位圆、比值）
Discover Topics
Optimization Problems
Probability
Differential Equation
Statistics
Rational Numbers