Why use sin^2() in calculating a potential and how can you go from 3 to 5?

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The discussion centers on the use of sin^2() in potential calculations, questioning its necessity and suggesting it may be an error in the referenced book. Participants express uncertainty about whether sin(\theta) should be used instead. Additionally, there is a query about transitioning from a three-dimensional to a five-dimensional context. The conversation highlights the need for clarity in mathematical representations. Overall, the thread emphasizes the importance of accuracy in mathematical expressions.
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why do the use sin^2()? en who can you go from 3 to 5.
http://img413.imageshack.us/img413/3919/verband1bismy6.jpg
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Thanks.
 
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Looks to me like a simple error in the book. Should be sin(\theta) rather than sin squared.
 
I thinks also but I'm not certain.

Thanks.
 
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