Two parter! x the points a. find the period and amplitude of the cosine function. b. at what values of for do the maximum value(s), minimum values(s), and zeros occur?

A) As you can see in the graph attached, the repeating pattern of the function is π, therefore the period is:
 Period=π
 The amplitude is:
 Amplitude=4-(-4)/2=8/2
 Amplitude=4
 b) The graph shows that the maximum values are (Where y=4):
 Maximum values: 0,π,2π
 The minimum values are (Where y=-4):
 Minimum values:π/2,3π/2
 The zeros are:π/4,3π/4,5π/4,7π/4