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How could I evaluate this IMPROPER integra?

  1. Nov 3, 2007 #1
    Int from 1 to infinity of ln(X)/x^(3)

    --> Any ideas on how to get started(mainly the technique)? thank you.
     
  2. jcsd
  3. Nov 3, 2007 #2

    Dick

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    You would first find an indefinite integral using integration by parts.
     
  4. Nov 4, 2007 #3
    Let u = ln x and dv/dx = x^-3 and use integration by parts.
    And see what happens as the upper bound of the integral tends to infinity.
     
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