$\tan x=-1$
$\int\frac{x-2}{\left(x^2+2x+2\right)\left(x-4\right)}dx$
$\int\frac{2x+1}{x^4+5x^2}dx$
$\frac{y^{7}z^{4}-5xy^{5}z^{2}}{-4xy^{2}z}$
$8\left(d\:+\:5\right)\:=\:12d\:-\:8$
$x^3-27x$
$\lim_{c\to1}\left(\frac{c^2+3c+2}{c^2-c-2}\right)$
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