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Tangent perpendicular to radius
Author:
Big Lee
GeoGebra
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祖冲之的期望：内棋与外棋
科氏力 (Coriolis Force)
圓的切線方程
斜率的值
【案例】2013年安徽高考15题
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百分數（小學）：折扣 / 賺賠（HTML5 版）
文創花燈
y=a(x-h)²+k的副本
全等—正方形的旋转
翰林數學_2下_CH4-3_梯形中線性質
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Right Triangles
Tangent Line or Tangent
Stochastic Process or Random Process
Piecewise Functions
Differential Equation