16coffeem 16coffeem
  • 09-01-2018
  • Mathematics
contestada

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

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potterhead320
potterhead320 potterhead320
  • 21-01-2018
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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