Answer:
max = 8
min = -8
Step-by-step explanation:
Sinusoidal functions take the form of
y(x) = Acos(ωx + Ф) + k
where A is the amplitude.
k is your vertical shift.
Ф is your phase shift (horizontal shift).
In your case, you have
y = 8cos(x)
y = 8cos(x + 0) + 0
your amplitude is 8 and you're not shifting, so you max and min is just the positive and negative value of your amplitude.
