$xy-2x$
$\frac{dy}{dx}=4x+y+5$
$2x^2-4x+1<\:0$
$\int\left(\frac{x^5+3x^2-8}{x-2}\right)dx$
$\left(7a^2+2b\right)\left(7a^2-2b\right)$
$2\log\left(x+2\right)+\log\left(x+1\right)$
$630+525$
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