$49m^2-169n^2$
$\frac{d^2}{dx^2}\left(\sin\left(x^2+y^2\right)\right)$
$\frac{dy}{dx}=y^2-2y-8$
$2ydx+e^{-3}dy=0$
$\int\left(-2+\frac{9}{x}\right)dx$
$\frac{x^4+x^3-1}{x^3-2x^2}$
$\left(x^3+\frac{1}{x^2}\right)^4$
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