$\int\frac{x}{\left(x^2+9\right)^{1.7}}dx$
$5x+2<2x-1$
$\frac{\left(x+2\right)\left(2x+4\right)}{-x^2-x-2}$
$\frac{d}{dx}4xe^{-4x}$
$r^{16\:}\:-\:16s^8$
$a^2+2a-8$
$4xy+x^2+yx+1$
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