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畫出對稱圖形
第八周作业
兩組對邊相等的四邊形
近似值：有效數字
找出對稱軸
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Parallelogram 02
Normal Distribution
sine graph (reduce to 1/2 and then translate leftward by 15 degree)
边长可变的正三角形上莱洛转子的滚动
Copy of 20151104 四邊形 P2
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Circle
Rotation
Fractions
Differential Calculus
Exponent