$8n^6-1$
$x^2+12x+8$
$7-4cosx=7$
$9x^2+90x+225$
$\left(\frac{x}{x-1}\right)\left(x+3\right)$
$-176-80$
$\left(x+y^2\right)\left(x-y^2\right)\left(x^4+x^2y^4+8\right)$
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