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Author:李政憲

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兩組對邊相等的四邊形
画直线等分三角形的面积
拼砌四邊形
找出對稱軸
畫出對稱圖形

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三個硬幣的正面數
snooker
testing
What's wrong
圆周率π的收敛极快算法（代数几何方法）

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Unit Circle
Vectors
Cosine
Trigonometric Functions
Isosceles Triangles

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