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Homework Statement
Looking at the picture I have attached the problem is very straight forward. In the denominator of the equations I have posted the teacher uses 2[itex]\Pi[/itex] but the book uses 4[itex]\Pi[/itex]. Can someone please explain to me why is that.
Homework Equations
Book's equation:
Teacher's Soln:
The Attempt at a Solution
Please refer to attached pictures.
Attachments

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