Find the period, range, and amplitude of the cosine function.
y = –4 cos 8x
A. period = 1/4, range = –4 ≤ y ≤ 4, amplitude = 4
B. period = 1/4pi, range = –4 ≤ y ≤ 4, amplitude = 4
C. period = 1/2pi, range = –4 ≤ y ≤ 4, amplitude = –4
D. period = 1/2, range = –4 ≤ y ≤ 4, amplitude = –4
1 answer
A. period = 1/8pi (or 1/4), range = -4 ≤ y ≤ 4, amplitude = 4