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三角函數sine跟cosine
Author:
JUNWAYLIANG
GeoGebra
New Resources
三位數除以一位數（二）
兩組對邊相等的四邊形
四邊形的特性
近似值：有效數字
畫出對稱圖形
Discover Resources
椭圆的定义
平行四邊形柱展開
歐拉圓
蝴蝶定理动态演示
自學材料_兩位數乘兩位數
Discover Topics
Frequency Distribution
Scalene Triangles
Real Numbers
Conic Sections
Optimization Problems