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解析幾何:線對稱
Author:
leoM
A 和 A' 的中點 M = (A+A') / 2 而且 M 會在直線 L 上 我們先設法向量為 u 可以寫出: A' = A + t*u 所以 M = ( 2A + t*u ) / 2 再將 M 代入 L 的方程式中解 t 便可求得 A'
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