ПОМОГИТЕ упростить:(x^4-y^4)/(x^3+yx^2-xy^2-y^3)-2y

Question

ПОМОГИТЕ
упростить:
(x^4-y^4)/(x^3+yx^2-xy^2-y^3)-2y

Answer 1

(x^2 + x^2)(x-y)(x+y)/(x^2 (x+y) ×(-y^2 (x+y)) =
=( x^2 + y^2)/(x+y)