Final answer:
The letter C tells us information about phase shifts.
Step-by-step explanation:
In the generic form y = Asin(Bx + C) + D, the letter C tells us information about phase shifts.
A phase shift in a periodic function represents a shift of the entire graph to the left or right. In this equation, Bx + C represents the angle of the phase shift. Changing the value of C will shift the graph horizontally.
For example, if C = 0, there is no phase shift and the graph starts at the origin. If C = π/2, the graph is shifted to the right by a quarter of a period.