Question

Find the amplitude and midline: y = 4-2cos (t)

Answer 1

General equation is y  =  A cos (Bt + C) + D

Where A = Amplitude

D = Vertical Shift

Period = 2pi / B

 

The Equation

y   =  4 - 2 cost (t)

y   =   -2 cos (t) + 4

A = -2

Amplitude  =  -2

D = 4

Vertical Shift = 4

Here Midline is vertical shift

Hence, Midline = 4