$\frac{dy}{dt}=\frac{4e^{-2t}}{y^{-2}}$
$\frac{dy}{dx}=2xy-y+4x-2$
$4.2+1.25+3+0.6$
$k^2-3k$
$y'+2y=3e^{4x}$
$rs+4s$
$\int x^4e^{z^2}dx$
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