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二倍角的正切公式的证明
Author:
桃篮翁
GeoGebra
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兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
異分母分數減法
畫出對稱圖形
錐體建築師
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excenter of triangle
我的第一個GGB動畫
矩形
y=asin(kx+b)+c的圖形1061030
S3 Ex4.3 Q03(3D圖)
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Histogram
Rectangle
Stochastic Process or Random Process
Reflection
Translation