The function y = cos(x - pi/2) is a cosine function with a phase shift to the right by pi/2 units. This means that the usual peak of the cosine wave, which occurs at x = 0 for the standard cosine function, will now occur at x = pi/2 for this shifted function.
The function y = cos(x - pi/2) is a cosine function with a phase shift to the right by pi/2 units. This means that the usual peak of the cosine wave, which occurs at x = 0 for the standard cosine function, will now occur at x = pi/2 for this shifted function.