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This is a mistake right?

  1. Oct 1, 2013 #1

    Turion

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    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

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

    SteamKing

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    Remember, sin and cos are periodic functions with period 2k*pi, k = integer.
     
    SteamKing, Oct 1, 2013
  5. Oct 2, 2013 #4

    Turion

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    @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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