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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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第八周作业
異分母分數減法
【案例】2018年全国1卷理科12题
算柱 (兩位數)
兩組對邊相等的四邊形
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圍棋名人賽
P6 圓周01A
Tangent perpendicular to radius
定积分中的二次函数曲边三角形面积.许兴华数学
拋物線軌跡
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Constructions
Polygons
Perimeter
Stochastic Process or Random Process
Combinatorics