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把圓方程化為(X加减a)平方+(Y加减b)平方=0 得圓中心座標.求(4.-3)到圓的切線.把兩個點帶進去.有2條切線.我可以跟你算出來..不過還是自己算好點..這比那個人說的具體多了吧..他說的我都看不懂.--#
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