$\frac{m}{m^{-4}}$

$\left(\frac{x^2y^{-1}+x^{-1}y^2}{x^{-1}+y^{-1}}\right)$

$\lim_{x\to2}\left(\frac{1-\cos\left(6x\right)}{2x}\right)$

$x\frac{dy}{dx}+y=\frac{y\left(ln\left(y\right)+1\right)}{ln\left(y\right)}$

$3y^2\:+3y^2+3y^2+2y$

$\left(9a^2b^4-16x^8\right)^2$

$x^2-2x+1=81$