$\frac{r}{16}<1$
$\left(3x\:-\:4\right)^2$
$\frac{cos\left(2y\right)-xsin\left(2y\right)}{x}$
$\frac{d}{dx}xy^4+x^2y=x+3y$
$\lim_{x\to0}\left(arctan\left(2x\right)x^2\right)$
$x^6-8y^3$
$4x\:+\:8\:=\:20$
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