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三角函數由來= =
Author:
陳柄何
GeoGebra
New Resources
兩位數加法
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（二）
畫出對稱圖形
拼砌四邊形
Discover Resources
橢圓
題6
對數函數
齒輪作圖
合 24（附答案）
Discover Topics
Trapezoid
Circumcircle or Circumscribed Circle
Line Segment
Definite Integral
Conditional Probability