Упрости выражение

\(\dfrac{4ab^2-b^3}{(b-a)^2}+\dfrac{a^3+b^3}{(a-b)^2}+\dfrac{4ab^2}{2ab-a^2-b^2}=\) [ \(\frac{a^3}{(a-b)^2}\) | \(\frac{2a^2}{(a+b)^2}\) | \((a-b)^2\) | \(\frac{a^3+1}{(a+b)^2}\) ]