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诱导公式五（90°+α）
Author:
桃篮翁
GeoGebra
New Resources
拼砌四邊形
画直线等分三角形的面积
三位數除以一位數（二）
四邊形的特性
找出對稱軸
Discover Resources
glt-h02-03-角錐角柱動態展開
Centroid
可积准则
ABC 3
空間坐標
Discover Topics
Isosceles Triangles
Incircle or Inscribed Circle
Equilateral Triangles
Differential Equation
Natural Numbers