This expression simplifies to:

[((x+y)-(x-y))/(xy)] / (x^2 + y^2)

Simplifying the numerator first:

[(x+y)-(x-y)] = x + y - x + y = 2y

Now substitute this back into the expression:

[(2y)/(xy)] / (x^2 + y^2)

Now simplify:

2/y(x^2 + y^2)

Therefore, the simplified expression is 2/y(x^2 + y^2).