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Introduction to Trigonometry from a Unit Circle
Author:
Lam Yat Chun
GeoGebra
New Resources
拼砌四邊形
錐體建築師
畫出對稱圖形
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
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World's Hardest Easy Geometry Problem.
特別角的三角函數值(2)
倒數計時
周界
橢圓代數性質,光學性質,生活應用
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Random Variables
Kite
Tree Diagrams
Diagrams
Root