∫(x^4+1)/[(x-1)*(x^2+1)]dx
=∫(x^4-1+2)/[(x-1)*(x^2+1)]dx
=∫(x^2+1)/(x-1)+2/[(x-1)*(x^2+1)]dx
=∫(x^2-1+2)/(x-1)+2/[(x-1)*(x^2+1)]dx
=∫(x+1)+2/(x-1)+[1/(x-1)-(x+1)/(x^2+1)]dx
=∫[x+1+3/(x-1)-x/(x^2+1)-1/(x^2+1)]dx
=x^2/2+x+3ln(x-1)-1/2ln(x^2+1)-arctanx+C
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