$\frac{dy}{dx}=2+x^2+y^2\:-\:2xy$
$sec=-\frac{5}{2}$
$x^4+2x^2-8$
$2x^2>18$
$\int\left(\frac{x^3}{\left(2+x^4\right)^2}\right)dx$
$\frac{a^2b^3}{-a^2b^3}$
$x^2+2xy+y^2-16$
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