(2.0 + 2.0*x)/(-1.0 + x)^2 + (1.0 + x)^2*(2.0 - 2.0*x)/(-1.0 + x)^4
4 2 2 (-1 + x) *(2 + 2*x) + (1 + x) *(-1 + x) *(2 - 2*x) -------------------------------------------------- 6 (-1 + x)
/ 2 \ 2*(1 + x)*\(-1 + x) + (1 + x)*(1 - x)/ --------------------------------------- 4 (-1 + x)