$\frac{x^2+2x\:-3}{x^2+1}$
$a^5+9a^3$
$\int\frac{3x-1}{x\left(x-1\right)\left(x+3\right)}dx$
$\sqrt[5]{9^5}$
$\int sdx$
$15m^2n+7mn$
$\lim_{x\to\infty}\left(\frac{e^{x^4}}{6-x^5}\right)$
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