х^3-1/х^3+2х^2+2х+1 упростить​

(x-1)(x²+x+1)/(x³+1)+2x(x+1)= (x-1)(x²+x+1)/(x+1)(x²-x+1)+2x(x+1)= (x-1)(x²+x+1)/(x+1)(x²+x+1)= (x-1)/(x+1)