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f(x^2-3)=logx^2/(x^2-6) =log(x^2-3+3)/(x^2-3-3) 所以f(x)=log(x+3)/(x-3) 真數大於0 (x+3)/(x-3)>0 (x+3)(x-3)>0 x3 所以定義域 (-∞,-3)∪(3,+∞)
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