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诱导公式五（90°+α）
Author:
桃篮翁
GeoGebra
New Resources
撒针估算面积实验
盈利與虧蝕
直線的斜率
第八周作业3
正方形雪花图案
Discover Resources
Newton
初心者的進化
Graph of Sine Function 正弦函數圖像
Centroid
五上複合圖形的面積
Discover Topics
Planes
Logic
Unit Circle
Polygons
Matrices