$\int\left(\frac{1}{2x^3}\right)dx$
$\int_0^3\frac{x^2}{\sqrt{9-x^2}}dx$
$\lim_{x\to-3}\left(\frac{5x^2+15x}{x+3}\right)$
$a^2b^2-4ab$
$y''+3y'+9y=0$
$\frac{dy}{dt}-2y=4-t$
$3x\ge-\frac{2}{3}$
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