$\lim_{x\to\infty}\left(\sin\left(x\right)-x\right)$
$12abc-5-12abc+8$
$9-3+10-5-\left(-4\right)+\left(-1\right)$
$\lim_{x\to\infty}\left(\frac{x-1}{x-4}\right)^x$
$4z^2+9-12z$
$a=x^2+10x+25$
$\frac{x^2+7x+4}{x+1}$
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