Unity is .

Compare the complex number with .

Here and .

Write in polar form.

and .

and .

The polar form of is .

.

The complex number has distinct roots found by the

, where .

Write the expression square roots.

Here .

Thus, .

Substitute in the above expression (1).

.

Substitute in the expression .

.

Substitute in the above expression .

.

Substitute in the expression .

.

Fourth roots of unity are and .

Fourth roots of unity are and .