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sinα + sinβ > 0 ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
球体的体积推导（优化版）
錐體建築師
球體建築師
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百分數：折扣、盈利與虧損
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Kite
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Confidence Interval
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