How do you use the amplitude and period to graph #y=5+8cos2x#?
This cosine wave has mean level along y = 5.
The period of y = b+a cos( kx + c) is
The amplitude is a and the mean level is y = b.
Here, b = 2, a = 8 and k = 2. So, the period is
The graph of one full wave is between
The crest (zenith) is at (0. 13) and the lowest point (nadir) is at