$9x^2-18xy+9y^2$
$60.655\:-\:75$
$x^3-x^4$
$\frac{x^2}{2}+lnx-\frac{1}{2}$
$\frac{25x^7y^8}{5x^5y}$
$\left(4-x^2-y^2\right)^2$
$\frac{dy}{dt}=-5y\:+\:4+t$
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