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sin&cos

Author:iamkoa

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画直线等分三角形的面积
兩位數除以一位數（一）
球体的体积推导（优化版）
【案例】2018年全国1卷理科12题
拼砌四邊形

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數學傳播39卷4期, 平面幾何公式思考
tool1
Book10-Unit7-拼出平行四邊形
拋物線3--平行四邊形法
拋物線軌跡

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Tree Diagrams
Ratios
Interest Calculation
Multiplication
Upper and Lower Sum or Riemann Sum

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