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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
【案例】2018年全国1卷理科12题
錐體建築師
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
判斷球體
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可积准则
等線段作圖
題二
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Discover Topics
Quadratic Functions
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