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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
拼砌四邊形
畫出對稱圖形
兩組對邊相等和有直角的四邊形
四邊形的特性
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相似三角形證明
Primeter
多邊形外角和
拋物線：切線與弦中點
Copy of 愛心
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Distributions
Tree Diagrams
Frequency Distribution
Linear Equations
Fractal Geometry