$5cos^2x-1$
$94x^2+12x-16$
$\frac{d}{dx}\frac{r}{\sqrt{r^2+7}}$
$\lim_{x\to3}\left(\frac{x^2-9}{x^2+5x+6}\right)$
$\frac{dy}{dx}=6x^2-x^2y$
$\left(\frac{a}{2}-\frac{b}{2}\right)$
$x^2+11+28$
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