$\sqrt{x+10}-\sqrt{x+19}=-1$
$\int_0^45xdx$
$\int\:\:x^2e^{-\frac{x}{2}}dx$
$\int\frac{2x+3}{x^2-4x+5}dx$
$a^2-32am^3n^2+256m^6n^4$
$\lim_{x\to0}\left(\frac{\sqrt{x+4}}{x}\right)$
$\lim_{x\to\infty}\frac{4x^2+5}{2x-1}$
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