$\left(\left(x\cdot e^y\right)+\left(e^y\right)\right)\cdot y'=x-1$

$\frac{a^2b^2c^2}{4}\cdot\frac{5a^2b^3}{3}$

$4x^2+4x+4mn-2$

$\lim_{x\to0}\left(\frac{ln\left(r^2\right)}{\frac{1}{r}}\right)$

$8x-3y-9x+5y-2x+y$

$\left(\frac{6x^2}{5}-\frac{3\sqrt{3}y^3}{4}\right)^2$

$\frac{x^2}{x-2}$