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極座標 r=cos(Θ / 2)
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GEOGEBRA啟
GeoGebra
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球體建築師
GeoGebra笔记功能体验课件
球体的体积推导（优化版）
找出對稱軸
兩位數加法
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百分數
From:PTT 國小題目求面積
藝術著色2
zentangle
序列（圆内弦）
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Rhombus
Tree Diagrams
Integral Calculus
Continuity
Calculus