$7x^2+6x$
$\frac{2x^2-6x+4}{x+5}$
$\frac{n^2-9}{n+3}$
$\int_0^{\infty}e^{-x}cos\left(wx\right)dx$
$\frac{dy}{dx}=3x^2\left(5x^{-4}+2\right)$
$\int_0^{\pi}\left(\frac{1}{cosx+1}\right)dx$
$\frac{7x+2}{3x^2-10x-8}$
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