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Conceptual problem with integration by parts.

  1. Sep 7, 2009 #1
    Why is it that whenever we encounter a question which can be solved by integration by parts, we get half the function?

    I mean, suppose a differentiated f(x)g(x) yielded [tex]{f'(x) g(x)dx + f(x)g'(x)dx}[/tex], then why do we get only [tex]{f'(x) g(x)dx}[/tex] to extract the original function (f(x)g(x)) from?
     
  2. jcsd
  3. Sep 7, 2009 #2
    Ok...let's forget about this question for now...dont answer it.
     
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