graph one cycle of the given function. state the period , amplitude, phase shift, and vertical shift of the function 7. y=-1/3 cos (1/2x+pi/3) 11. y=-3/2cos (2x+pi/3) - 1/2 Solution 7.) y = A sin(Bx + C) + D Amplitude = -1/3 Period= 2pi/(1/2)=4*3.14=12.56 phase shift = - (pi/3)/0.5=-2pi/3 vertical shift= 0.