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三角函數with sine, cosine圖形
Author:
Eric Chang-Chien
GeoGebra
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滾動圓周來發現圓周長
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同心圓和線段
极坐标系
动态演示面动成体：圆柱、圆锥、圆台、球
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Root
Parametric Curves
Tree Diagrams
Curve Sketching
Reflection