$\frac{x^2-9}{x^2-2x-3}$
$\lim_{x\to\infty}\left(\sqrt[4]{\frac{1+81x^3}{x^3+2}}\right)$
$\lim_{x\to3}\left(\frac{x-3}{\sqrt{4x+4\:}-4}\right)$
$\frac{4x^3+x^2-4}{x-1}$
$\left(x^3+5\right)\left(x^3-12\right)$
$3a^4-2a+a^4$
$\left(-5\cdot6+12-15+53\right)+\left(-4\right)$
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