1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Basic Integration

  1. Apr 8, 2010 #1
    How do I integrate equations such as:

    (x^2 + y^2)^-1/2 dx


    I've completely forgotten and I'm in Uni at the moment. I was answering a question on find the electric field of a charged rod and I couldn't finish it because I didn't know how to integrate something like this.
  2. jcsd
  3. Apr 8, 2010 #2


    Staff: Mentor

    First off, that's not an equation. An equation always has = somewhere in the middle.

    The usual approach for this type of integral is trig substitution, with tan w = x/y, sec^2(w)dw = dx/y, and y sec(w) = sqrt(x^2 + y^2). (As far as the integration is concerned, y is considered to be a constant.)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook