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: Complex variables

  1. Oct 19, 2009 #1
    1. The problem statement, all variables and given/known data

    I want to express the following function like the one above:

    2. Relevant equations

    f(z) is a complex function

    3. The attempt at a solution


    this is where i stopped because i got stuck. any help please?
  2. jcsd
  3. Oct 19, 2009 #2


    Staff: Mentor

    Check your work in the expression before the last =.
    i(x + iy) = ix + i2y = -y + ix. The other one is OK.

    So one of your expressions will be e-y + ix = e-yeix = e-y(cos x + i sin x) = e-y cos x + i e-y sin x. Do about the same thing to the other expression and add the two together.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook