$\frac{d}{dx}\left(\sqrt{\frac{x-3}{x^8+1}}\right)$
$x^2-x-342$
$x^2-18x+81=0$
$\int e^{10x-9}dx$
$\frac{-9x^2+x^4+x-3}{x+3}$
$-24\::-3$
$x^2-6x+19=1$
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