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Splitting a function into odd and even parts

  1. Mar 30, 2012 #1
    Hi, i've been looking at Fourier transforms, odd and even functions and such recently. But i'm a little confused about how exactly you split a function up. I know the general forumla and seen the derivation, however when i do it with a proper function i never seem to get the correct answer. Was hoping someone might be able to illustrate with the following example how they obtained the final answer, explaining while going would be a huge benefit and i'm grateful for any guidance that can be offered.

    For example;

    Split the function f(x) = (1 + x) e^
    into odd and even parts. Express your result in
    terms of x, cosh x and sinh x.

    The general forumla from the Mary boas Maths/Physics book;

    f(x) = ((f(x) + f(-x))/2) + ((f(x)-f(-x))/2)

    Thanks again.
  2. jcsd
  3. Mar 30, 2012 #2


    User Avatar
    Science Advisor
    Homework Helper

    try it on e^x, and then on xe^x. the second one should be pretty easy after doing the first one (why?).

    and try e^(ix), since presumably you know that answer.
  4. Mar 30, 2012 #3
    Just to check. When i'm using that general formula where it says f(x) do i just plug the function? and where it is f(-x) plug but changing the x's and see what it forms.
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