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: Help Calculating Definite Integral

  1. Nov 11, 2011 #1

    realism877

    User Avatar

    1. The problem statement, all variables and given/known data

    (2(x)^2)/((x+1)((x)^2+1)) from 0 to 1







    The indefinite answer is (1/2)ln2+ln2-(pi/4)

    How did it get to this answer?(3/2)ln2-(pi/4)
     
    realism877, Nov 11, 2011
  2. jcsd
    Phys.org - latest science and technology news stories on Phys.org
  3. Nov 11, 2011 #2

    LCKurtz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Use partial fractions to write the integrand as
    [tex]\frac A {x+1}+\frac{Bx+C}{x^2+1}[/tex]
     
    LCKurtz, Nov 11, 2011
  4. Nov 11, 2011 #3

    realism877

    User Avatar


    I did that.

    I already have the solution. I'm just trying to figure out where the 3 came from.
     
    realism877, Nov 11, 2011
  5. Nov 11, 2011 #4

    LCKurtz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Oh my! I thought you had a calculus question about integrating. Instead you have an elementary algebra question. See if you can figure out how to combine like terms and make your answer agree with the given answer.
     
    LCKurtz, Nov 11, 2011
  6. Nov 11, 2011 #5

    Ivan92

    User Avatar

    What do you mean the indefinite answer? Where are the x's?

    You will need to show us your work in how you got to your answer. You might have made an error in your work.
     
    Ivan92, Nov 11, 2011
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook