Question

Помогите упростить выражение (y/x-y + x/x+y) : (1/x^2 + 1/ y^2) - y^4/ x^2-y^2

Answer 1

((х+у+х-у)/(x^2-y^2))/(x/( x^2-y^2)) = (2x/(x^2-y^2))* ((x^2-y^2)/x) = x