9000034809

Given complex numbers $z_1=2(\cos \frac{\pi }{6}+\mathrm{i}\sin \frac{\pi }{6})$ and $z_2=\sqrt{3}(\cos \frac{4\pi }{3}+\mathrm{i}\sin \frac{4\pi }{3})$, find the angle in the polar form of the product $z_1{z}_2$.