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Author:
enming
GeoGebra
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漂亮的摇摆曲线
祖冲之的期望：内棋与外棋
平行線的斜率
垂直線的斜率
画直线等分三角形的面积
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二次函数的条件最值
Lagrange
立體展開圖
Mathematics and Optics (and their applications)
奔马
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Matrices
Straight Lines
Ratios
Numbers
Tangent Function