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: Another quick integration q

  1. Aug 1, 2008 #1
    the question is [tex]\int 2x sec^2 (x^2) dx[/tex]

    do i sub u= sec (x^2) ?

    I so far have got to trying to sub u= sec(x^2) and getting du= 2 (sec x^2 tan x^2)... i have a strong feeling i fudged the "du" part. hmm.
  2. jcsd
  3. Aug 1, 2008 #2

    [tex]du=2xdx[/tex] which you have! What is the anti-derivative of [tex]\sec^2 x[/tex] ???
  4. Aug 1, 2008 #3
    oh right, so i've got du=2xdx,

    intergral sec^2 u du

    = tan u + c

    sub back u=x^2

    =tan x^2 +c

    how does that look?
  5. Aug 1, 2008 #4


    User Avatar
    Science Advisor
    Homework Helper

    It looks just fine.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook