Amplitude is half the distance between the minimum and maximum values of the range of a periodic function with a bounded range.
In other words, for functions of the form y = A sin bθ or y = A cos bθ, the amplitude is |A|.
A. - 4
D. - 3
Correct Answer: B
Step 1: Recall that "for functions of the form y = A cos bθ, the amplitude is |A|".
Step 2: So, 4 is the amplitude of the given function.