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