Time Harmonic Maxwell's Equations

Iamgod
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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)?
 
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nobody knows?
 
any comment ??
 
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