a a+b
- + ---
b a-b
_______
a a-b
- - ---
b a+b
In other terms:
[(a/b)+(a+b)/(a/b)]/[(a/b)-(a-b)/(a+b)]


I tried to multiply both denominator and numerator by [b(a+b)(a-b)}] but that didnt seem to work for me.