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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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球体的体积推导
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【案例】2013年安徽高考15题
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第八周作业
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題 6
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函數與反函數的導數關係
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Subtraction