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Math Help - mathematical transition of an integral

  1. #1
    MHF Contributor
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    mathematical transition of an integral


    (this posted has latex errors i dont know why)
    here is a print screen of the post

    in here in the end
    i got an arch that startes at A and end in B
    he wrote this integral
    <br />
\intop_{a}^{d}\frac{{dl}}{r^{2}}<br />
    but point a and be are not values that i can put in
    if my function depends on "r" then i need to change dl to be dr expression somehow
    ?
    i think that the integral should go from 0 to pi
    and dl should be d theta expression (instead of dr)
    and dl =r*d(theta)
    R is constant
    i get
    <br />
\intop_{0}^{2\pi}\frac{{Rd\theta}}{R^{2}}<br />
    i get 2pi/R
    this resolt is different from the resolt he gets
    why?
    Last edited by transgalactic; April 18th 2011 at 03:45 AM.
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  2. #2
    MHF Contributor
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    He's getting 2piR/Rē which is 2pi/R, there is no difference
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