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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提：α + β + γ = 0
New Resources
畫出對稱圖形
球体的体积推导
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
兩位數加法
Discover Resources
waaachen
(1+x/n)^n 逼近 exp(x)
圓定理2.1
希瓦定理
長方形的周界與長和闊的關係 (教師版)
Discover Topics
Pythagoras or Pythagorean Theorem
Parametric Curves
Variance
Numbers
Conic Sections