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诱导公式三（x轴对称关系）
Author:
桃篮翁
GeoGebra
New Resources
判斷球體
四邊形的特性
兩組對邊相等的四邊形
球體建築師
美國國旗 (Claude 版)
Discover Resources
if指令
rotational symmetry_3
北門高中
长方形边线展开
翰林數學_2下_CH4-2_特殊平行四邊形有關對角線的性質
Discover Topics
Vectors
Prism
General Quadrilateral
Sine
Upper and Lower Sum or Riemann Sum