$\frac{4x^2-8x+1}{x^3-x+6}$
$\lim_{x\to\infty}\left(\frac{cos6x}{6x}\right)$
$csc\theta\:=\frac{\left(cot^2\theta\:\right)}{csc\theta\:+1}+1$
$2x^2+12x+11$
$\lim_{x\to3}\left(\frac{\sqrt{x+6}-1}{x-4}\right)$
$\frac{x-12}{7}<3$
$a^6+14a^3b+49b^2$
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