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x^2+y^2-4x-5=0 (x-2)^2+y^2=9 圓心座標O(2,0),半徑r=3 OP=7-2=5 設切線長是L 畢氏定理:OP^2=L^2+R^2 25=L^2+9 L=4 即切線長是4
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