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Orthocentre

Author:Big Lee

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拼砌四邊形
判斷球體
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
找出對稱軸

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雙曲線
音調與空氣柱
正四面體
學習活動五之一在解區域中由平行線法找出極值
圓例4

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Indefinite Integral
Logarithmic Functions
Secant Line or Secant
Frequency Distribution
Vectors 3D (Three-Dimensional)

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