What is an equation for the cosine graph shown below? A coordinate system has a horizontal axis labeled from -135 to 225 in increments of 45 and a vertical axis labeled from 0 to 12 in increments of 1. From left to right, a curve decreases in quadrant 2 to a minimum at (-135, 4), increases to a maximum at (-45, 12), decreases passing through (0,8) to a minimum at (45, 4), increases to a maximum at (135, 12), decreases to a minimum at (225, 4), then increases through quadrant 1. Responses y= 4 cos(theta - 135) 12 y = 8cos(theta- 135) 4 y = 4 cos(0-90 ) 8 y= 4cos[2(theta-135)] 2