$\int\frac{4x^2}{\sqrt{1-x^2}}dx$
$\frac{99}{-9}$
$\frac{dy}{dx}\:-\:2y=x$
$a^2-20ac+100c^2$
$\left(2xy\right)^3+\left(3xy\right)^2-\left(3xy\right)^3$
$\sqrt{-72}$
$2xy'+y=6x$
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