$\frac{1}{\cos\left(a\right)}-3$
$m^2+50m+336$
$x^8-49y^6$
$\left(x-a\right)\left(x+4a\right)$
$4y^2\:dx\:+y^2e^{-x}\:dy\:=0$
$\lim_{x\to-\infty}\left(\frac{8x^2+x}{x+6}\right)$
$\frac{3x^4+8^2-1}{x+2}$
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