`Q=int (x^4)/(x^4-1)dx`
`Q=int 1+1/(x^4-1)dx`
`Q=x+P`
`P=int 1/(x^4-1)dx=int1/((x-1)(x+1)(x^2+1))dx=int A/(x-1)+B/(x+1)+(Cx+D)/(x^2+1)dx`
`A=1/4 , B=-1/4 , C=0 , D=-1/2`
`P=int (1/4)/(x-1)-(1/4)/(x+1)-(1/2)/(x^2+1)dx`
`Q=x+1/4ln|(x-1)/(x+1)|-1/2arctanx`
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