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把圓化作標準形式:(x-3)^2+(y-1)^2=1 則過圓上定點(x0,y0)的切線方程通式為 (x0-3)(x-3)+(y0-1)(y-1)=1. 代入(4,1)得x0=1,僅此一解.則切線為x=4. 若代入後,仍有兩個未知量,則還要通過圓方程求解.
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