lim(n->∞) ((n+1)^3+(n+2)^3)/((n+4)^3+(n+3)^3)
lim(n->∞) (n³ + 3n² + 3n + 1 + n³ + 6n² + 12n + 8) / (n³ + 12n² + 48n + 64 + n³ + 9n² + 27n + 27) = lim(n->∞) (2n³ + 9n² + 15n + 9)/(2n³ + 21n² + 75n + 91) = 1