20.5 Writing Equations from Graphs Each graph below contains the primary cycle of a sine or cosine wave. For each wave, identify the amplitude, period, phase Shift, and midline; then write an equation of the form y = Asin(BI + C) + D or y = Acos(Bx + C) + D to match the wave. Note: The unlabeled tick marks on the z-axis correspond with multiples of , ", a 24. 2 + -1 25. to 165Practice: Sine and Cosine Graphs For the functions in problems 1 - 4 below, do the following. . Identify the amplitude, period, phase shift, and midline equation of the wave. . Graph the primary cycle of the wave. Carefully label the coordinates of all maximum, minimum, and midline points. 1. f(x) = -2 cos (") I 2. p(I) = .5 sin(1) - 2 3. g(x) = -3sin(2c + 7) + 1 + 166