$\left(4b+8\right)\left(4b-8\right)$
$\:y^4-81z^{12}$
$\left(2\sin\left(x\right)+2\right)\left(2\sin\left(x\right)-2\right)$
$\left(1-t\right)^4$
$\left(3y-2\right)\cdot9y^2+6y+4$
$240-18-\left(-2\right)$
$\:x^4\:-x^2\:-12$
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