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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提：α + β + γ = 0
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三位數除以一位數（一）
画直线等分三角形的面积
兩位數除以一位數（一）
球体的体积推导
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