$\left(x+2\right)^3\:\left(x-2\right)^3$
$\frac{x^2+2x+8}{x^4-4x^2}$
$2h^2+15h+8$
$4x-4+4x-4$
$-3+10-8-45+15$
$\left(a-20\right)\left(a+20\right)$
$x^2+5x+49$
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