$3a^2\:x\:3a^2b^{-2}$

$\frac{3x-4}{2}$

$\frac{\left(\tan\left(x\right)-\cot\left(x\right)\right)}{\tan\left(x\right)+\cot\left(x\right)}=2\sin^2x-1$

$-3x-8\ge-2$

$\left(3y^7-7x\right)\cdot\left(9y^{14}+21y^7x+49x^2\right)$

$\frac{10^{4}\cdot10^{6}}{10^{3}}$

$\lim_{x\to1}\left(\frac{x^3\:-3x^2-\:6x+8}{x-1}\right)$