(sqrt(2 pi x)(x/e)^x)^a/(sqrt(2 pi a x)(a x/e)^((a x)))- x!^a/(a x)!,a=2(sqrt(2 pi x)(x/e)^x)^a/(sqrt(2 pi a x)(a x/e)^((a x)))- x!^a/(a x)!,a=2

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