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Strange Integral- Does it even exist?

  1. Jul 25, 2008 #1
    I was watching DonnyLee's videos on youtube and I noticed something strange. I think he picked u=x and du=dx, and if I'm right (?) he picked v= [tex]\int x dy/dx[/tex] but does that even equal to y? But that can't be right because the right side kept the original expression. Some help might clear up the fuzziness

    https://www.youtube.com/watch?v=<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/GAkkTa2XpEc&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><embed src="http://www.youtube.com/v/GAkkTa2XpEc&hl=en&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>
  2. jcsd
  3. Jul 25, 2008 #2
    can't see any video.... give the link
  4. Jul 25, 2008 #3
  5. Jul 25, 2008 #4
    I believe:

    u = y. du = dy/dx * dx.
    dv = d/dx* x * dx. v = x.
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