$\frac{\left(x^3+3x-4\right)}{x-1}$

$\frac{d}{dx}y=x^{\frac{2}{3}}+4$

$\lim_{x\to+0}\left(cos\left(x\right)\right)^{\frac{7}{x^2}}$

$\left(2x+1\right)^2-x^2+\left(x+6\right)\left(x-1\right)-2x-3$

$\frac{a^3b^{-2}c^{-4}}{x^{-2}y^{-3}z^5}$

$\frac{x^3y^7}{xy^3}$

$\frac{v^{-3}}{v^3}$