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log(x+1)(x^2+x-6)^2>=4=log(x+1)(x+1)^4 當x+1>1,x>0 (x^2+x-6)^2>(x+1)^4 (x+3)^2(x-2)^2-((x+1)^2)^2>0 (x^2+x-6-x^2-2x-1)(x^2+x-6+x^2+2x+1)>0 (-x+5)(2x^2+3x-5)>0 (x-5)(x-1)(2x+5)
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