$12+4x<8$

$\int\frac{1}{x^{2\:}}dx$

$4\left(3y-2\right)^2-9\left(y-1\right)$

$\left(x^2-1\right)\cdot\left(x-1\right)$

$-\lim_{t\to\infty}\left(\frac{t^q}{e^{-t}}\right)$

$\lim_{x\to0}\left(\frac{1-\sqrt{x+1}}{1+\sqrt{x+4}}\right)$

$\int280\left(6x+4\right)^{-\frac{1}{2}}dx$