Complex Frequency Derivation-Magically Appearing "j"s

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Homework Statement


From Hayt "Engineering Circuit Analysis". I'm just wondering how the imaginary "j" multipliers appeared.
upload_2017-12-21_1-58-48.png


Homework Equations

The Attempt at a Solution


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biker.josh07 said:
From Hayt "Engineering Circuit Analysis". I'm just wondering how the imaginary "j" multipliers appeared.
I think that the "magic" involved was a printer's error. Looks like a typo in the text to me.
 
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