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Author:
郭逸民
GeoGebra
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【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题
球体的体积推导
柱體建築師
球体的体积推导（优化版）
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雙曲線的軌跡
quadrilaterals 5
第一冊
circle
开关灯
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Tangent Function
Geometric Transformations
Multiplication
Trigonometric Functions
Angles