$99^8\sqrt{144k^8}$
$100x^2-20xy+y^2$
$-4x^2+10x+24$
$\left(5m^2+6mn^3\right)^2$
$\frac{z^{2}-18x}{z}$
$\frac{d^2}{dx^2}\left(2-3x\right)^2$
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