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廣義角的代換(90度加減角度)
Author:
yuchengda
GeoGebra
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圓周公式的應用
球体的体积推导
兩位數除以一位數（二）
圓的切線方程
漂亮的摇摆曲线
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Percentage
優良作品4(楚耘)
向量的座標變換矩陣與線性組合
布丰投针实验
HKDSE 2015 by Mr LO WY
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Correlation
Continuity
Combinatorics
Prism
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