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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
球体的体积推导
【案例】2018年全国1卷理科12题
畫出對稱圖形
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用極座標做時鐘
gtx-f03-taiwan-01 台灣國徽
CIRCLE
椭圆的定义
圓周公式應用題2的副本
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Sine
Calculus
Power Functions
Confidence Interval
Step Functions