Final answer to the problem
$x^2-1$
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1
Apply the formula: $\left(a+b\right)\left(a+c\right)$$=a^2-b^2$, where $a=x$, $b=1$, $c=-1$, $a+c=x-1$ and $a+b=x+1$
$x^2-1$
Final answer to the problem
$x^2-1$
