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诱导公式五（90°+α）
Author:
桃篮翁
GeoGebra
New Resources
畫出對稱圖形
錐體建築師
算柱 (兩位數)
小数 的副本
三位數除以一位數（一）
Discover Resources
平行四邊形
Circumference 圓周
弦心距垂直平分弦
證明三角形內角和180度
立體圖形
Discover Topics
Normal Distribution
Logic
Isosceles Triangles
Difference and Slope
Vectors 3D (Three-Dimensional)