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Homework Help: Can someone solve it?

  1. Sep 17, 2010 #1
    [tex]\int\sqrt{1+u^{2}} du
    Last edited: Sep 17, 2010
  2. jcsd
  3. Sep 17, 2010 #2

    Char. Limit

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    Yes, but I'd rather I helped YOU solve it.

    Try a substitution [itex]u=tan(\theta), du=sec^2(\theta) d\theta[/itex]. It might not make this any easier, but it's the best method I can think of right now.
  4. Sep 17, 2010 #3
    i tried it. but i didn't can
  5. Sep 17, 2010 #4

    Char. Limit

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    Well, you should get as your equation...

    [tex]\int sec^3(\theta) d\theta[/tex]

    And from there it's a simple integration by parts, taking u=sec(\theta) and dv=sec^2(\theta).
  6. Sep 17, 2010 #5


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    Moderator's note: thread moved from Calculus & Analysis
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