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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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美國國旗 (Claude 版)
湖南省张毅郴数字教研工作室 logo
拼砌四邊形
Earth with coastline
直角坐標平面上的旋轉變換
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