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三角函数（单位圆） 的副本
Author:
petrel2015
GeoGebra
New Resources
常见四边形是否是双心四边形
撒针估算面积实验
平行線的判定
盈利與虧蝕
折扣
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軌跡,摺紙,滾動,實驗觀察,曲線
directed number_the age of father and son
圓周率的應用 題C
blue
【2020高考】新高考全国1卷（山东卷） 第16题
Discover Topics
Polynomial Functions
Dilation
Function Graph
Straight Lines
Complex Numbers