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Author:
周利利
GeoGebra
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中华人民共和国国旗
双心四边形
直線的斜率：水平變化 & 鉛垂變化
龙形曲线-分形龙2
平行線的判定
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藝術著色2
南女校徽外型
All in one (Centres of triangle)
sin 的泰勒展開式
時鐘
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Square
Numbers
Linear Functions
Trigonometric Functions
Tangent Line or Tangent