Results 1 to 4 of 4

Math Help - help

  1. #1
    Newbie
    Joined
    Jan 2008
    Posts
    2

    help

    plz solve it
    Attached Files Attached Files
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Math Engineering Student
    Krizalid's Avatar
    Joined
    Mar 2007
    From
    Santiago, Chile
    Posts
    3,654
    Thanks
    11
    First two questions are not well typed. It should be dy\,dx.

    Now, to make polar transform, draw the region you're integrating.

    The first integral in polar coordinates is \int_0^{2\pi } {\int_0^1 {r\,dr\,d\theta } } . (I dunno if this is the integral, but its result agrees with the double integral in cartesian coordinates.)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Math Engineering Student
    Krizalid's Avatar
    Joined
    Mar 2007
    From
    Santiago, Chile
    Posts
    3,654
    Thanks
    11
    The second question is equal to the first one.

    We have a full circle. This in polar coordinates

    \int_0^{2\pi } {\int_0^a {r\,dr\,d\theta } } .

    Or by reversing integration order. (Fubini-type Theorem.)
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Jan 2008
    Posts
    2

    Thanks

    Thank You Krizalid.
    Follow Math Help Forum on Facebook and Google+


/mathhelpforum @mathhelpforum