$\sqrt[18]{18^9}$

$xy\:+y+x+1$

$\lim_{x\to\frac{x}{2}}\frac{\sin x+1}{2}$

$xy^{-7}\:\left(\:x^8\:y^3-y^2+x^{-7}\:y^{-6}-xy^{-7}\:z+3\right)$

$36b^3a^3+30ba^2$

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

$3\cdot\left(5x-1\right)+\left(x-1\right)\left(x+1\right)-\left(x-1\right)^2$