How can I change the symbol z to w in this figure?

In the following figure, how can I change the symbol z to w in this figure because I do not want to be confused with other z in the functions, and $f b(1/z)$. (z which wants to change circled by red ).
I appriciate any help.
Thanks

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Asked:

on 21 Jun 2023

Answered:

on 21 Jun 2023

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