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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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GeoGebra笔记功能体验课件
兩位數加法
異分母分數減法
三位數除以一位數（二）
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Properties of Inequalities 不等式的加法與乘法性質
堆剁蕊
九點圓
「相似三角形」任务2的副本
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Line Segment
Standard Deviation
Orthocenter
Exponential Functions
Unit Circle