$\frac{x^532-x^4+x^2-2}{x^2+1}$
$12x-2x^2-4$
$-83+495$
$-\left(2ax-3b\right)^2$
$\left(x+3\right)\left(x-4\right)$
$\lim_{x\to\infty}\left(-\frac{1}{1+\frac{\sqrt{x^2+x}}{x}}\right)$
$-110-60-50$
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