$\left(\frac{2}{5}xy-\frac{3}{4}mn^2\right)^2$
$\int\frac{10}{x\sqrt{x^2-64}}dx$
$49x^6-70yx^3z^2+25y^2z^4$
$x^2+b\:x\:x+36$
$2m+7=19$
$e^x\frac{dy}{dx}=5x$
$\left(xy+y\right)dx-dy=0$
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