$9a^2-49^6$
$-2x^2-5x-2$
$8.2h\:+\:2.8h$
$17m^3n^3-51m^2n^2\:+\:85mn$
$cos^2x=3sin^2x$
$\frac{dy}{dx}=\frac{y^2-4y}{y^2+1}$
$\int\frac{4x^5}{\sqrt{5-12x^6}}dx$
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