$\lim_{x\to-\infty}\left(\frac{\left(x-2\right)}{\left(x^2+1\right)}\right)$
$16x^4+y^2=1$
$\int\:\frac{2x-1}{x^2+2x+10}dx$
$z^2-40z+20=0$
$11x+12^3\:$
$\sqrt{x^2}+2$
$4x-4=40$
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