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角α与-α的正弦函数关系
Author:
lelove2212
验证：角α与-α的正弦函数关系
GeoGebra
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球体的体积推导（优化版）
判斷球體
錐體建築師
GeoGebra笔记功能体验课件
兩組對邊相等和有直角的四邊形
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cosine graph 變換
空間中兩向量夾角
三節棍
三角形的五心
识货
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Translation
Dilation
Boxplot
Geometric Distribution
Fractions