$a^2+2a-9$
$8x^2-8x+5$
$e^{3y}dy=e^{2x}dx$
$-7\left(5+3\right)-\left|-6\right|$
$t^3\sqrt{t}^4-1\:$
$\lim_{x\to0}\left(\left(\left(\frac{\sqrt{x+4}-\sqrt{x^2+x+4}}{x}\right)\right)\right)$
$-5\left(2f-7\right)-3$
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