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Office_Shredder

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

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SteamKing

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

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

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