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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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漂亮的摇摆曲线
画直线等分三角形的面积
讀磅
空间中两直线的位置关系
兩位數除以一位數(一)
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展開基本
指数函数
分數變身術
學習活動七頂點法
Illusion-平行线错觉
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Bar Chart or Bar Graph
Rhombus
Variance
Means
Definite Integral