$36x^3+18x^2-4x$
$\lim_{x\to6}\left(\frac{x}{\left|x-6\right|}\right)$
$3m\left(x\right)+n\left(x\right)$
$3\sec^2x=4\tan^2x$
$\frac{10}{17.3\:tan}$
$-4c\:-\:2c$
$xz+ylnz=z^2$
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