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利用单位圆生成y=sin（x）在[0,2pi]的图象
Author:
孙琰
GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
兩組對邊相等的四邊形
球體建築師
柱體建築師
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log and power funtion
樞紐內容
双曲线和直线的位置关系
圓心角圓周角弦切角
答重庆杨志友椭圆的定义
多邊形的切割與拼砌的副本
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Addition
Secant Line or Secant
Probability
Real Numbers
Matrices