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由圖可知x=2為圓的一條切線 圓心(3,2)半徑r=1 設另一條切線的斜率為k y-4=k(x-2)kx-y+4-2k=0 |3k-2+4-2k|=√(k^2+1) k=-3/4 切線方程3x+4y-22=0
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