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诱导公式五（90°+α）
Author:
桃篮翁
GeoGebra
New Resources
直角坐標平面上的旋轉變換
畫出對稱圖形
兩位數除以一位數（二）
第八周作业
三位數除以一位數（一）
Discover Resources
test
man1
Sonia and Julie
堆叠方块
算柱 (兩位數)
Discover Topics
Polynomial Functions
Bar Chart or Bar Graph
Real Numbers
Kite
Symmetry