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Indefinite Integrals

  1. May 24, 2013 #1
    1. The problem statement, all variables and given/known data
    [itex] ∫1/(t*ln(t)) dt [/itex]

    [itex] ∫1/(√(t)*[1-2*√(t)]) dt [/itex]

    2. Relevant equations

    3. The attempt at a solution

    I used u-substitution for both. For the first equation, my u= ln t, and my final answer was ln|u| + C, or ln(ln(|t|) + C. For the second equation, my u= 1-2*√(t) and my final answer was -ln(u) or -ln(1-2*√(t)) + C.

    But both of these are wrong, so I'm not sure what I did wrong. Can I get some guidance on this? Thank you. :)
  2. jcsd
  3. May 24, 2013 #2


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    Science Advisor
    Homework Helper

    Both of those are correct as far as integration goes. Must be an error in the answering system.
  4. May 24, 2013 #3
    Oh wow, that makes me feel better now. Thank you! :)
  5. May 24, 2013 #4


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    Staff: Mentor

  6. May 25, 2013 #5
    Thank you! That site helps.
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