$x^2+15x+50$
$169-196z^4$
$\frac{dy}{dx}=\frac{\sqrt{xy}}{y+1}$
$-5x^2+7x^2-3y^2-x^2$
$n^2-81$
$\lim_{g\to0}\left(\frac{\sqrt[3]{x+g}-\sqrt[3]{x}}{g}\right)$
$\frac{a^mb^n}{a^2b^3}$
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