Evaluate the expression frac(a+b)2−(a−b)24ab\\frac{(a+b)^2 - (a-b)^2}{4ab}frac(a+b)2−(a−b)24ab for any a,b≠0a, b \neq 0a,b=0.
111
000
frac12\\frac{1}{2}frac12
222