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-1/8 ≤ cosα cosβ cosγ ≤ 1
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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拼砌四邊形
画直线等分三角形的面积
球體建築師
兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
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阿波羅尼斯相關問題：與兩相切圓外切和一圓內切
平行線 (同位角 - 4對)
rectangle_tktcps
體積
指数函数的副本
Discover Topics
Sine
Algebra
Definite Integral
Unit Circle
Multiplication