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Cartersian double integral converted to polar and then evaluated #2

  1. Apr 18, 2009 #1
    1. The problem statement, all variables and given/known data
    convert line one to polar integral and then evaluate
    see problems 16 attachement

    2. Relevant equations

    3. The attempt at a solution
    I changed to polar and evaluated the double integral but I come up with an answer of negative pi which seems odd since it is an area value and should be posititve. What did i do wrong?
    see problem 16 attachement

    Attached Files:

  2. jcsd
  3. Apr 18, 2009 #2

    Tom Mattson

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    Staff Emeritus
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    Gold Member

    You made a careless sign error at the start of the 4th line. There should be a negative in front of the integral in that step.
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