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三角函數sine跟cosine

Author:JUNWAYLIANG

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兩組對邊相等的四邊形
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
兩位數加法
異分母分數減法

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线段的最值
Angle Between a Line and a Plane Definition 線與平面的交角定義
概率与频率关系
圓錐截痕模型
黄金三角形到螺旋线（表格法）

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Straight Lines
Trapezoid
Incircle or Inscribed Circle
Vectors 2D (Two-Dimensional)
Equilateral Triangles

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