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三角函数（单位圆） 的副本 (2)
Author:
Darren Dong
GeoGebra
New Resources
四邉形 (四年級) 教師版
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
畫出對稱圖形
找出對稱軸
Discover Resources
中點軌跡(動點在兩圓上)
proof25陳佑豪
Math Project
杯麵
Uses of Trigonometry