$9r^2-4r+1$
$64a^2-49b^2$
$\lim_{x\to0}\left(\frac{e^{2x}-1}{5x^3}\right)$
$0.000070\cdot0.0030$
$\int\frac{x+2}{1-x^2}dx$
$-110+-45-82$
$\frac{x^{2+x+4}}{x-1}$
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