$\:-571\:+-\:497$
$9w^2-13w+4$
$x2-11x+18$
$y'=-4y+3\cdot\:\:e^{-t}$
$\lim_{x\to1}\left(\frac{x-5}{x-1}\right)$
$xy-2=x$
$\frac{d^{28}}{dx^{28}}\left(\cos\left(\pi\right)\right)$
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