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x²;+y²;-6x-4y+12=0(x-3)²;+(y-2)²;=1圓心為(3,2)半徑為1設切線為y=k(x-4)+4圓心到切線距離=半徑即|2-k|/根號下(k²;+1)=1(2-k)²;=k²;+1解得k=3/4當k不存在時x=4也於圓相切所以切線…
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