$m^2+6mn+9n^2$
$z=3x-20y+8z$
$\frac{d}{dx}\left(\frac{\left(5-x\right)^7\sqrt{x^3+x}}{x^3e^x}\right)$
$\frac{d}{dx}5x^2-12$
$a-5+5$
$\int\:x^2\sqrt{x^3+31}dx$
$\frac{8\sqrt{3}}{4}$
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