Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

This is a mistake right?

  1. Oct 1, 2013 #1
    The highlighted in yellow is a mistake, right? I might be going insane.

    Where does the PI go?
     

    Attached Files:

  2. jcsd
  3. Oct 1, 2013 #2

    Office_Shredder

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    [tex] \cos(4(t+\pi)) = \cos(4t+4\pi) = \cos(4t) [/tex]
     
  4. Oct 1, 2013 #3

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Remember, sin and cos are periodic functions with period 2k*pi, k = integer.
     
  5. Oct 2, 2013 #4
    @Office_Shredder: Opps. Nice catch.

    @SteamKing: Isn't the period 2pi/k where k is the coefficient of t?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: This is a mistake right?
  1. Where is the mistake? (Replies: 1)

  2. Right track (Replies: 5)

Loading...