$\left(w^2+w-1\right)\left(w^2+w+1\right)$
$5x^2-7x-90$
$\left(-2\right)^2-1$
$\left(4x^3+5y^2\right)^2$
$\left(8s+4\right)^2$
$\left(\sqrt[5]{t^7v^3}\right)^3$
$\left(3x^{3\:}-5\right)^2$
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