= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) (4/(x+y)^2)= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) (4/(x+y)^2)= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) (4/(x+y)^2)= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) (4/(x+y)^2)= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) * (4/(x+y)^2)= (4x/(x-y)(x+y) + 4(x^2+y^2)(x-y) + 4x(x-y)) / (x+y)^3= (4x/(x-y)(x+y) + 4(x^2+y^2)(x-y) + 4x(x-y)) / (x+y)^3
= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) (4/(x+y)^2)
= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) (4/(x+y)^2)
= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) (4/(x+y)^2)
= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) (4/(x+y)^2)
= (x/(x-y) + (x^2+y^2)/(y^2-x^2) + x/(x+y)) * (4/(x+y)^2)
= (4x/(x-y)(x+y) + 4(x^2+y^2)(x-y) + 4x(x-y)) / (x+y)^3
= (4x/(x-y)(x+y) + 4(x^2+y^2)(x-y) + 4x(x-y)) / (x+y)^3