The simplified value of \(\left(1- \dfrac{2xy}{x^2 + y^2}\right) \div \left(\dfrac{x^3 - y^3}{x-y} -3xy\right)\) is

The simplified value of \(\left(1- \dfrac{2xy}{x^2 + y^2}\right) \div

1.	The simplified value of \(\left(1- \dfrac{2xy}{x^2 + y^2}\right) \div \left(\dfrac{x^3 - y^3}{x-y} -3xy\right)\) is
A.	\(\dfrac{1}{x^2 - y^2}\)
B.	\(\dfrac{1}{x^2 + y^2}\)
C.	\(\dfrac{1}{x - y}\)
D.	\(\dfrac{1}{x + y}\)
Answer» C. \(\dfrac{1}{x - y}\)