1.

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

A. \(\frac{1}{{{x^2} - {y^2}}}\)
B. \(\frac{1}{{{x^2} + {y^2}}}\)
C. \(\frac{1}{{x - y}}\)
D. \(\frac{1}{{x + y}}\)
Answer» C. \(\frac{1}{{x - y}}\)


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