$\left(xy\:+\:xz\right)\:3$

$\left(7z^3-8y\right)^2$

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

$\left(3x^2\right)\left(-5x^3y^2\right)$

$\frac{dy}{dx}=\left(2\cdot y+3\right)^2$

$-3^3+6-3^2-9-3+6$

$\lim_{h\to0}\left(\frac{cos\left(\frac{\pi}{3}+h\right)-\frac{1}{2}}{h}\right)$