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cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
Author:
羅驥韡 (Pegasus Roe)
Topic:
Complex Numbers
GeoGebra
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三位數除以一位數（二）
找出對稱軸
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
球體建築師
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