1. Not finding help here? Sign up for a free 30min 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!

Periodic functions

  1. Dec 14, 2003 #1
    I'm doing a practice exam for a math test on thursday, wondering if anyone could help figure out how to get from one step to the next. i dont think that the background info is necessary for these two steps.

    the file is attached (Adobe acrobat).

    what i am wondering about is the answer under (2b).
    If the solution for finding (del)u(x,y) were lettered a through d (4 steps, i am wondering how the professer got from b to c.

    of course i have emailed him as well.

    Attached Files:

  2. jcsd
  3. Dec 14, 2003 #2
    Look in the last line of the 2b) paragraph.
    \Delta \frac{16}{\pi^4 kl(k^2+l^2)}sin(k \pi x)sin(l \pi y) = [/itex]
    [itex] \frac{16}{\pi^4 kl(k^2+l^2)}(-\pi^2 (k^2 + l^2)sin(k\pi x)sin(l\pi y))


    Last edited: Dec 14, 2003
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Periodic functions
  1. Period of oscillation (Replies: 8)

  2. Period of oscillation (Replies: 3)