$\frac{u+u^2}{1-u}$
$\left(x^2+3\right)^3\cdot2x$
$\frac{dx}{dt}=\left(\frac{1}{3}\right)x\left(6-x\right)$
$85\cdot39$
$y'+4y=0$
$\frac{dy}{y}=\frac{4}{1+x}dx$
$30x^2y^2-10y^2+20xy$
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