Chapter 8, Problem 5T

To determine

To evaluate: The product $z_1{z}_2$ and quotient $\frac{z_1}{z_2}$ of the complex numbers $z_1=4\left(\cos \frac{7\pi }{12}+i\sin \frac{7\pi }{12}\right)$ and $z_2=2\left(\cos \frac{5\pi }{12}+i\sin \frac{5\pi }{12}\right)$.