clc
clear

x=-5 +8i;
y=10 + 5i;

xy=x*y;
mag_xy=abs(xy);
angle_xy = angle(xy);

z=x/y;
mag_z=abs(z);
angle_z=angle(z);

disp(mag_xy)
disp(angle_xy)

disp(mag_z)
disp(angle_z)