Question: what is the period and amplitude of the cosine function?
Answer: Amplitude and Period of Sine and Cosine Functions. The amplitude of y=asin(x) and y=acos(x) represents half the distance between the maximum and minimum values of the function. Amplitude = |a| Let b be a real number. The period of y=asin(bx) and y=acos(bx) is given by.