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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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【案例】2013年安徽高考15题
柱體建築師
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画直线等分三角形的面积
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T7 geobra
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