Question Find the period, range, and amplitude of the cosine function.

Question

y = –4 cos 8x
Responses
period = 1/4, range =-4 ≤ y ≤ 4, amplitude = 4
period = 1/4 pi, range =-4 ≤ y ≤ 4, amplitude = 4
period = 1/2 pi, range =-4 ≤ y ≤ 4, amplitude = -4
period = 1/2, range =-4 ≤ y ≤ 4, amplitude = -4

Answer 1

Correct response:
period = 1/8π, range = -4 ≤ y ≤ 4, amplitude = 4