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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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學資p.13第7題
圈柱
Copy of 劉徽的「割圓術」
題11
動態幾何錯覺
翰林數學_2下_CH3-1_多邊形的外角和
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Scalene Triangles
Real Numbers
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Vectors 2D (Two-Dimensional)