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Tangent perpendicular to radius

Author:Big Lee

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異分母分數減法
找出對稱軸
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题

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Circumference 圓周
angle between planes
圓錐曲線截痕 to 定義式
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Hypothesis Testing
Functions
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