1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    User Avatar
    Gold Member

    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

    User Avatar
    Gold Member

    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

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Moderator's note: thread moved from Calculus & Analysis
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook