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trigo ratios np2c
Author:
np2cmath
GeoGebra
New Resources
錐體建築師
判斷球體
三位數除以一位數（一）
畫出對稱圖形
第八周作业
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立體錯覺樓梯(使用透視法會稍有差距)
畢氏定理動態證明(歐基里得，平形四邊形等面積2，應用時間參數跳躍函數配合向量)
circle1
(006)80201辛宇婕
cos(α) + cos(β) + cos(γ) 的對稱性
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Probability
Tangent Function
Orthocenter
Planes
Sequences and Series