$\frac{2x^2+5x^3+4x^2-x-1}{2}$
$\left(-5\right)x\left(-5\right)^6$
$\left(3ab^2+c\right)^2$
$\lim_{x\to0}\left(n^{2.5}\right)$
$\lim_{x\to\infty}\left(\sqrt{x^2+6x-7}-\sqrt{x^2-2x-15}\right)$
$9x^2+18y+9$
$\lim\:_{x\to\:-5}\frac{5x+4}{x+8}$
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