$16+72-8-32-56\cdot8$
$x^2+3x+15$
$\left(x-1\right)\left(x+9\right)\left(x+1\right)\left(x+3\right)$
$45x^2-81$
$x^{\frac{2}{3}}\left(\sqrt{x}-\frac{1}{\sqrt{x}}\right)$
$\left(x+2\right)\left(x-2\right)+\left(x+4\right)\left(x-4\right)$
$4x^2y^2-1$
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