$\lim_{x\to-2}\left(\frac{1}{\left|x+2\right|}\:+\:x^2\right)$
$\lim_{x\to0}\left(\frac{1}{\tan\left(x\right)^2}\right)$
$\left(5-x^3\right)^4$
$\left(9x^{2}+6x-7\right)+\left(-9x-5\right)$
$x^2-6x-90$
$6xy+21$
$\int xd^{-3x}$
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