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三角函數由來= =
Author:
陳柄何
GeoGebra
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算柱 (兩位數)
找出對稱軸
判斷球體
拼砌四邊形
異分母分數減法
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相似圖形基本概念
以剪貼比較圖形大小 題3
正弦函數描點作圖
正方形轉轉
圆周上的动点形成椭圆
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Trigonometric Functions
Curve Sketching
Definite Integral
Cube
Combinatorics