Time Harmonic Maxwell's Equations

[Iamgod]

Homework Statement

The question is simple, I want to obtain Eq.5 from Eq.2 using Eq.1.

Homework Equations

http://img150.imageshack.us/img150/1108/question.png

The Attempt at a Solution

Can anybody explain how Eq.4 becomes Eq.5, what does happen to Re (Real part)?

 

[Iamgod]

nobody knows?

 

[Iamgod]

any comment ??