$r\left(x\right)=\frac{2x^2}{x^4+1}$
$2m^{-2}\cdot3m$
$16r^6+64s^6+64r^3s^3$
$4d+6t$
$\int\frac{x^{2}+1}{\left(2x-1\right)^{3}}dx$
$\lim\:_{x\to\:\:1}\left(\frac{\sqrt{x-1}}{x-1}\right)$
$3\left(2x+2\right)>4x-10$
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