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Double integrals

  1. Feb 27, 2010 #1
    to evaluate the integral:

    I=dxdy/(x^2+y^2)^(1/2)


    over domain D:
    given by 1<=x^2+y^2<=4.

    what should i take the limits to integral?
    dx and dy
     
  2. jcsd
  3. Feb 27, 2010 #2

    tiny-tim

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    Welcome to PF!

    Hi splelvis! Welcome to PF! :smile:

    (have a square-root: √ and try using the X2 tag just above the Reply box :wink:)
    One of the limits will be -2 to 2 … let's say for y.

    Then just look at the graph …

    for a fixed value of y, what does x go from and to? :smile:
     
  4. Feb 27, 2010 #3
    thank you i got that
     
  5. Mar 1, 2010 #4
    Hello,
    I think polar coordinates is a good choice for this one. :)
     
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