$\frac{m^2-169n^2}{m+13n}$
$8cos^2x-2cosx-1=\:0$
$x+x+x+4$
$4e^{-2x}x^3-12e^{-2x}x^2+6e^{-2x}x$
$\int\left(2x-1\right)e^{-2x}dx$
$\frac{dy}{dx}\left(x^2y^2-y^2=x^2\right)$
$\int\frac{x}{\sqrt{9-49x^2}}dx$
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