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时之殇
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四邊形的特性
找出對稱軸
【案例】圆柱体内放置一个大球六个小球
拼砌四邊形
三位數除以一位數（一）
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Hypocycloid Wheel
-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Light reflected in hyperbola
雙曲線1 交點法
cos, sin 與單位圓的副本
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Similarity Transformation or Similarity
Correlation
Plane Figures or Shapes
Unit Circle
Subtraction