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26 August, 17:38

For the function given, state the middle line: ƒ (t) = 40cos (80t + 20).

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  1. 26 August, 20:38
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    The answer is y=0

    The amplitude is 40 since y=Acos (B) + C has amplitude A and vertical shift C. The vertical shift is C=0 and B = 80t+20 is related to horizontal frequency and shift. This means the graph of the cosine will oscillate between - 40 and 40. The middle line will therefore be the line y=0.
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