$\frac{-48m^{-4}n^2}{+20m^{-3}n^4}$

$\lim_{x\to\infty}\left(\frac{\ln\left(x\right)}{\sqrt{x}}-\frac{1}{x}\right)$

$8cot^2x+12cot\:x-8$

$\left(3\cdot10^{-1}\right)\left(0.6\right)^2$

$8x-5\ge67$

$\frac{1}{\left(x^4+5x^2+3x+6\right)^2}$

$\lim_{x\to-\infty}\left(\frac{\left(4x^3\:+6x\:-2\:\right)}{2x^3-4x\:+5}\right)\:$