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正弦图像

Author:高长乐

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四邊形的特性
畫出對稱圖形
Nested spiral octagon
近似值：有效數字
Earth with coastline

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圖三
定義拋物線
拋物線與弦相交的弓形區域
相似三角形證明
两角和的正弦公式几何证明1

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Geometric Distribution
Similar Triangles
Trigonometry
Right Triangles
Straight Lines

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