Opinion? Solids of Revolution/Integration Techniques

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Homework Statement



Hey everyone. In my calc course I need to create (or find on the web) a problem and apply the below two concepts that I learned in the class.

Concepts:
Solids of Revolution.
Integration Techniques: Parts, Substitution, or Partial Fractions.

Homework Equations



The problem I chose was:

http://curvebank.calstatela.edu/volrev/vase7.gif

The Attempt at a Solution



Well, the question I am asking is basically if this equation I found can be solved using one of the Integration Techniques. I was thinking Parts. Would that be right?
 
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Just expand it out. Then use the double angle formula for cos2x, to replace sin2x
 
So One of the Integration Techniques can't be used, then?
 
Integration by parts might make it more complex, substitution, I don't think will work and you can't split it into partial fractions.
 
Well, cruds.

Thank you! I'm off to find another problem then I guess. They did say I could also choose arc lengths. Maybe I'll go with that...
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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