1.

The sum of $$\frac{1}{{x + y}}$$and $$\frac{1}{{x - y}}$$is?

A. $\frac{{2y}}{{{x^2} - {y^2}}}$$
B. $\frac{{2x}}{{{x^2} - {y^2}}}$$
C. $\frac{{ - 2y}}{{{x^2} - {y^2}}}$$
D. $\frac{{2x}}{{{y^2} - {x^2}}}$$
Answer» C. $\frac{{ - 2y}}{{{x^2} - {y^2}}}$$


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