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sin函數相加
Author:
維尼軒軒
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球体的体积推导（优化版）
畫出對稱圖形
異分母分數減法
第八周作业
判斷球體
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Klein Bottle
圓的軌跡
加法有圖案
對稱之美
Pyth. theorem
Discover Topics
Exponential Functions
Step Functions
Symmetry
Variance
Upper and Lower Sum or Riemann Sum