Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Trigless integral?

  1. Oct 31, 2011 #1
    Is there a way to do this integral without substituting in sec?

    int sqr(x^2-1)


    Ive tried a bunch of things, but the only thing that works is using sec,

    Is there any other method?
     
  2. jcsd
  3. Nov 1, 2011 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    What's the problem with letting x = sec(θ) ?

    Well, you can alternatively use the substitution: x = cosh(t) → dx = sinh(t) dt .
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook