$k^4-17k^2+16$
$\left(y+21\right)\left(y-21\right)$
$2x^2-6x-8x^3-12x^4$
$9ax^2+15a+6a-3ax-5x-2x$
$\frac{dy}{dx}=\frac{3xy}{\left(x^2-1\right)\left(y^2\:+\:2\right)}$
$23^{18}\cdot\left(23^5\right)^4$
$\lim_{x\to\infty}\left(\frac{13x}{13x+4}\right)^{2x}$
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