$\left(\frac{y}{2}-\frac{x}{3}\right)^3$

$\frac{y}{xz\left(x+y\right)}+\frac{z}{xy\left(y+z\right)}+\frac{x}{yz\left(x+z\right)}$

$x^4-2x^3-18x^2+6+36$

$\frac{20^6}{5^6}$

$3x+2y-\left(x\left(x-y\right)\right)$

$\sqrt[2]{5^2}+12$

$\int\:\frac{8x^2\sqrt[3]{1-6x^3}}{3}dx$