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二倍角的正弦公式的证明
Author:
桃篮翁
GeoGebra
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錐體建築師
找出對稱軸
兩組對邊相等的四邊形
三位數除以一位數（一）
畫出對稱圖形
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Ex (AAS)
管路流量分析
sin函數
旋轉圓弧
翰林數學_2下_CH3-2_SSS作圖
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Distributions
Quadratic Equations
Sine
Translation
Equilateral Triangles