Răspuns:
(x^2 - 4)^2/[(x^3 - 4x) - 2(x^2 - 4)] =
(x^2 - 4)^2/(x^2 - 4)(x-2) =
(x^2 - 4)/(x-2) =
(x-2)(x+2)/(x-2) =
x+2
