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二倍角的正弦公式的证明
Author:
桃篮翁
GeoGebra
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兩位數加法
【案例】2018年全国1卷理科12题
漂亮的摇摆曲线
探究三角形的全等條件
球体的体积推导
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Problem1:(md+me+mf)/(ad+be+cf)=a
垂心與垂線
三角函數sine跟cosine
幻彩圆
堑堵 鳖臑 阳马
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Subtraction
Cuboid
Median Value
Trapezoid
Polygons