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综合（2）15.
Author:
Sylvie
GeoGebra
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三角函数 的副本
斐波那契螺旋弧线（表格法）
常见四边形是否是双心四边形
正方形雪花图案
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孔雀
Perpendicular lines
mjnsl8ba, 數列級數圖形3
Gazing Cow Problem (a)
y=sinx对称中心
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Piecewise Functions
Histogram
Addition
Sphere
Parametric Curves