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诱导公式三（x轴对称关系）
Author:
桃篮翁
GeoGebra
New Resources
Earth with coastline
Fibonacci Clock
球體建築師
第八周作业
兩組對邊相等的四邊形
Discover Resources
equilateral triangle construction
五位數
立体几何
線的面畫
平行四边形个数
Discover Topics
Pythagoras or Pythagorean Theorem
Ellipse
Confidence Interval
Functions
Parabola