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诱导公式五（90°+α）
Author:
桃篮翁
GeoGebra
New Resources
兩位數加法
画直线等分三角形的面积
畫出對稱圖形
柱體建築師
直角坐標平面上的旋轉變換
Discover Resources
方格紙上畫平行四邊形2
Addition and Subtraction of Directed Numbers (2) 有向數加減(2)
軌跡,摺紙,滾動,實驗觀察,曲線
軌道
两平面夹角
拉格朗日插值多項式
Discover Topics
Natural Numbers
Linear Programming or Linear Optimization
Binomial Distribution
Surface
Mathematics