$\frac{dy}{dx}=\frac{y^2+10y+25}{x^2-12x+36}$
$\lim\:_{x\to\:3}\left(\frac{x^2-4x+3}{2x-6}\right)$
$\frac{dy}{dx}=ysecx$
$2x^2-14x+24$
$\frac{dy}{dx}=\frac{x}{1+x+y+xy}$
$\left\{cot^2x,csc^2x\right\}$
$\frac{1}{x}+3<-4$
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