Help solving a complex numbers problem

[asdhkbbq2]

I can't solve it myself, please help.

http://i754.photobucket.com/albums/xx187/asdhkbbq2/MA1.jpg

Thanks all for who help.

 

[Redbelly98]

This looks like an exam.

 

[Gerenuk]

You should show that you at least tried doing some research on these problems.
For example do some research on polar form of complex numbers, logarithm of complex numbers and inversion of a matrix. Then ask more specific questions, rather than wanting a full solution.