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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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畫出對稱圖形
兩位數除以一位數（二）
第八周作业
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三位數除以一位數（二）
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同位角---不平行綫
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