$81a^6b^4c^2-126a^5b^6c+49a^4b^8$
$\int\frac{x^3+2x^2+3x-2}{\left(x^2+2x+2\right)^2}dx$
$y-16-192$
$\lim_{x\to\infty}\left(\frac{x+5}{x^2+2x-1}\right)$
$x^2y-3xy^2$
$2x+4y-5z=9$
$\left(\sqrt{5}+\sqrt{2}\right)\left(\sqrt{5}-\sqrt{2}\right)+\left(\sqrt{7}-3\right)\left(\sqrt{7}+3\right)$
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