1. Oct 1, 2013 #1

   Turion

   

   The highlighted in yellow is a mistake, right? I might be going insane.
   
   Where does the PI go?

    

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   Turion, Oct 1, 2013
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3. Oct 1, 2013 #2

   Office_Shredder

   

   Staff Emeritus

   Science Advisor

   Gold Member

   [tex] \cos(4(t+\pi)) = \cos(4t+4\pi) = \cos(4t) [/tex]

    

   Office_Shredder, Oct 1, 2013
4. Oct 1, 2013 #3

   SteamKing

   

   Staff Emeritus

   Science Advisor

   Homework Helper

   Remember, sin and cos are periodic functions with period 2k*pi, k = integer.

    

   SteamKing, Oct 1, 2013
5. Oct 2, 2013 #4

   Turion

   

   @Office_Shredder: Opps. Nice catch.
   
   @SteamKing: Isn't the period 2pi/k where k is the coefficient of t?

    

   Turion, Oct 2, 2013

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