Explore BrainMass

Explore BrainMass

    Evaluating an Integral using Jordan's Lemma

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    The problem is to find the value of the integral from 0 to INF of [(ln x)^2]/(x^2 +9).

    We are to use f(z)= [(Log z)^2]/(z^2 +9), where
    -pi/2 < Log z < 3pi/2. We are to use the curve C from -R to -p along the real axis, -p to p around 0, p to R along the real axis, and the curve Cr from 0 to pi.

    I am having several problems with this one, including:

    **finding the residue at 3i.
    **figuring out how to set up and equate the four integrals to 2pi(i) times the residue at 3i.

    © BrainMass Inc. brainmass.com February 24, 2021, 2:23 pm ad1c9bdddf
    https://brainmass.com/math/integrals/evaluating-integral-jordans-lemma-18001

    Solution Summary

    An integral is evaluated using Jordan's Lemma. The solution is detailed and well presented. A diagram is included.

    $2.19

    ADVERTISEMENT