### Home > PC > Chapter 11 > Lesson 11.2.2 > Problem 11-87

11-87.

Show that * *can be written as

Recall from problem 11-85 that can be written as:

Now use DeMoivre's theorem to write .

11-87.

Show that * *can be written as

Recall from problem 11-85 that can be written as:

Now use DeMoivre's theorem to write .