Final answer:
The range of the function y = 4cos x is [-4, 4].
Step-by-step explanation:
The range of a function represents the set of all possible values that the function can take. For the function y = 4cos x, the cosine function has a range of [-1, 1]. Multiplying this by 4 gives us a new range of [-4, 4]. Therefore, the range of the function y = 4cos x is indeed [-4, 4].
Learn more about Range of a function