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诱导公式五（90°+α）
Author:
桃篮翁
GeoGebra
New Resources
球體建築師
sanjiaohanshu
第八周作业
四邊形的特性
兩組對邊相等的四邊形
Discover Resources
Angle Sum of Pentagon (SWC)
應該是錯誤的圖
對數函數的內插法
二次函數
正n凸多邊形旋轉對稱／反射對稱
Discover Topics
Variance
Vectors 2D (Two-Dimensional)
Arithmetic Operations
Scalene Triangles
Vectors