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圓的方程整理後得(x-1)^2+(y+2)^2=1 可見其圓心是(1,-2),半徑r=1 根據圓的切線的特徵——圓心到切線的距離=圓的半徑 設該切線的斜率為k,那麼該直線的點斜式方程就是 y-3=k(x-2),整理成一般式可得 kx-y+3-2k=0 然後引入點到直線的距離公式 代入計算即可
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