$5x^2-44x-192$
$9a^2+\:6a\:$
$\frac{x}{1.9}=-4.7$
$\frac{13x}{2\sqrt{5}}-\frac{13}{\sqrt{5}}+\sqrt{5}$
$\frac{dy}{dx}=6x-xy-z$
$\int\left(\frac{x^3}{\sqrt{\left(4-x^2\right)}}\right)dx$
$\lim_{x\to\infty}\left(6x^2-2x-4\right)$
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