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