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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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【案例】2018年全国1卷理科12题
直線的斜率：水平變化 & 鉛垂變化
球体的体积推导
平行線的斜率
斜率的值
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平行四邊形面積教材四
梯形(面積)
點座標旋轉公式
拋物線軌跡
圓的外切圓
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Sine
Derivative
Sequences and Series
Conic Sections
Plane Figures or Shapes