Answer
$\displaystyle \frac{1}{xy},\qquad x\neq 0, y\neq 0,x\neq-y$
Work Step by Step
Complex rational expressions have rational expressions in the numerator or/and in the denominator.
Here, the numerator contains $\displaystyle \frac{1}{x}$ and $\displaystyle \frac{1}{y}$ whose LCD =$xy.$
(Exclusions from the domain are $x\neq 0, y\neq 0.)$
To get rid of these fractions, we multiply both the numerator and denominator with $xy.$
$ \displaystyle \frac{xy}{xy}\times\frac{\frac{1}{x}+\frac{1}{y}}{x+y}=\frac{y+x}{xy(x+y)},\qquad x\neq 0, y\neq 0,x\neq-y$
The expression has a common factor. Reduce.
$=\displaystyle \frac{1}{xy},\qquad x\neq 0, y\neq 0,x\neq-y$
