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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提：α + β + γ = 0
New Resources
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兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
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