partial fraction, (-2 (3 x^2-2 x+1) (x-1)^2 (x+1)^2)/((x^2+1)^2 (x^4+2 x^3+2 x^2-2 x+1))partial fraction, (-2 (3 x^2-2 x+1) (x-1)^2 (x+1)^2)/((x^2+1)^2 (x^4+2 x^3+2 x^2-2 x+1))

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