(3).

Notice that each of the three complex roots of w = 1 has the same magnitude, 1. This means that the points corresponding to each cube root lie the same distance from the origin; that is, the three points lie on a circle with center at the origin and radius 1.

Furthermore, the arguments of these cube roots are 0°, 120°, and 240°, the difference of consecutive pairs being 120° = 360°/3.This means that the three points are equally spaced on the circle, as shown in Figure.These results are not coincidental.

Graph :

n Fig