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sin函數相加
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維尼軒軒
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三位數除以一位數（一）
兩組對邊相等的四邊形
球体的体积推导
【案例】圆柱体内放置一个大球六个小球
找出對稱軸
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二項分佈
Reflectional Symmetry 反射對稱
Angle between line & plane
Trigonometric Relations(90,270)
S0E02 勾股定理
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Combinatorics
Real Numbers
Geometric Mean
Random Variables
Linear Regression