$-2x^2+18-36$
$12x^3-8x^2-4x$
$\frac{2x^4-2x^3+4x^2-5}{x+2}$
$540\cdot540$
$\lim_{x\to-2}\left(\frac{y+2}{\sqrt{y+3}-1}\right)$
$\sqrt[3]{x^{12}}+x^6$
$4\:-\:15$
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