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trigo ratios np2c
Author:
np2cmath
GeoGebra
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斜率的值
平行線的判定
龙形曲线-分形龙
祖冲之的期望：内棋与外棋
常见四边形是否是双心四边形
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線對稱圖形練習1
line equation
directed number_the age of father and son
fixed arc length and fixed shaded area
閱讀月曆
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Derivative
Natural Numbers
Translation
Continuity
Scalene Triangles