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教学素材：正切函数及其反函数
Author:
清风拂琴，陌上花开
GeoGebra
New Resources
探究三角形的全等條件
圓的切線方程
垂直線的斜率
球体的体积推导
三位數除以一位數（一）
Discover Resources
扇形滾動2
滾動的圓
DSE
string art
projection02 by Mr LO WY
Discover Topics
Reflection
Tangent Line or Tangent
Ellipse
Special Points
Parallelogram