$x^3-12x-3x+6$
$\left(5x+3\right)^2=5x^2+10x+9$
$\int\frac{x^4}{\left(x-2\right)^2\left(x+1\right)^2}dx$
$\lim_{x\to\infty}\left(\sqrt{x^2+2}\right)$
$-4\:\cdot8$
$\lim_{x\to\infty}\frac{45x^2-18^7+3}{16x^4-13x+45x^2}$
$4x^2-6x$
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