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Cartersian double integral converted to polar and then evaluated #2

  • Thread starter jimbo71
  • Start date
  • #1
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Homework Statement


convert line one to polar integral and then evaluate
see problems 16 attachement


Homework Equations


r^2=y^2+x^2



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
 

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Answers and Replies

  • #2
Tom Mattson
Staff Emeritus
Science Advisor
Gold Member
5,500
7
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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