$$\frac{ y-x }{ - { x }^{ 2 } + { y }^{ 2 } }$$
$\frac{1}{x+y}$
$$\frac{-x+y}{\left(x-y\right)\left(-x-y\right)}$$
$$\frac{-\left(x-y\right)}{\left(x-y\right)\left(-x-y\right)}$$
$$\frac{-1}{-x-y}$$
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