This is a mistake right?

  • Thread starter Turion
  • Start date
  • #1
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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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  • #2
Office_Shredder
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[tex] \cos(4(t+\pi)) = \cos(4t+4\pi) = \cos(4t) [/tex]
 
  • #3
SteamKing
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Remember, sin and cos are periodic functions with period 2k*pi, k = integer.
 
  • #4
143
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@Office_Shredder: Opps. Nice catch.

@SteamKing: Isn't the period 2pi/k where k is the coefficient of t?
 

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