y=(1+x^2)/(1-x^2)= [2-(1-x^2)]/(1-x^2)= 2/(1-x^2) - 1= 1/(1+x) + 1/(1-x) - 1= 1/(x+1) - 1/(x-1) - 1y(n) = (-1)^n*n!*1/(x+1)^(n+1) - (-1)^n*n!*1/(x-1)^(n+1) = (-1)^n*n!*[ 1/(x+1)^(n+1) - 1/(x-1)^(n+1) ]
