1. The problem statement, all variables and given/known data

The conjugation property is expressed as .

This property follows in a straightforward maner from the definition of the -transform, the details of which are left as an exercise.

2. Relevant equations

Z-transform definition:

3. The attempt at a solution

Given a complex sequence, its z-transform is

Hence, the z-transform of a conjugated sequence

Now, how come I didn't get the , as in ?

PS. I apologize beforehand for copying verbatim from physicsforums.