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两角差的余弦公式
Author:
不离不弃
GeoGebra
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錐體建築師
找出對稱軸
異分母分數減法
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
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Pappus 定理
Angle in Alternate Segment 3
左右
Angle between 2 planes
正弦函數 y=Sin(x)
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Random Experiments
Intersection
Prism
Triangles
Cuboid