The phase shift formula for a trigonometric function, such as y = Asin(Bx - C) + D or y = Acos(Bx - C) + D, is represented as C / B. If C / B is positive, the curve moves right, and if it is negative, the curve moves left.

Within the general sine function above, A represents the amplitude of the wave, while B represents the period, D is the vertical shift, and C is divided by B to find phase shift. The phase shift represents the horizontal movement of sinusoidal curves as demonstrated by their amplitudes and periods.