$\lim_{x\to\infty}\left(\frac{2x^2-9}{x\left(x^2+1\right)}\right)$
$\frac{dy}{dx}=e^x+y$
$x^2-5x\:<6$
$\int\left(10x+4\right)e^xdx$
$\frac{x^2-x-2}{x-1}$
$5x^2+340x-1428=0$
$3x^4-2x^4+7x^4$
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