$4\:-\:52\:-\:72\:+\:39$
$\frac{d}{dx}\left(6e^{yz}cos\left(xyz\right)\right)$
$17x+13+32-2x$
$\frac{y'}{y}=\frac{x+1}{x^20121}$
$\left(13x-7\right)\left(17x+7\right)$
$x^2y+x^2-4\:\frac{1}{2}+x^2$
$\int\frac{30x^2}{\sqrt{81-x^2}}dx$
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