$24x^2+30x+9$
$\frac{-y^2}{\left(-2x^{-1}y^{-4}\right)}$
$4-4^2$
$2+n+n-3$
$\lim_{x\to0}\left(\frac{x^2-3}{x}\right)$
$\left(x^n-8\right)\left(x^2-2\right)$
$\tan^2\left(x\right)\csc^2\left(x\right)-\tan^2\left(x\right)$
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