$6z^2+z-2$
$\lim_{x\to3}\left(\frac{x-4}{x-3}\right)$
$\frac{dy}{dt}=-\:\:\frac{t}{\left(y-2t\right)}$
$\left(\lim_{x\to0}\left(e^x+x\right)^{\frac{1}{x}}\right)$
$a^4+2a^2-24$
$\frac{2m^4n^{-1}}{\left(2m^4\right)^3}$
$\:\:-2b\:+\:5a\:+\:a\:-\:2\:\left[a\:+\:3b\:-\:4\:\left(a\:+b\right)\right]\:-12a\:$
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