Please explain the steps and answer

The photo shows a schematic diagram ofa rhythmically moving arm. The upper arm rotates back and forth From the point A; the position of the arm is measured by the angle a [in radians) between the actual position and the downward vertical position as shown in the graph. Q Edna Paw hwakaJShum Ismckmm Angle of Arm (radians) 0.6 Time [seconds] 0.6 (a) Find an equation of the form MB) 2 A sin(B(6l CD + D for the graph a(t). yo) = (b) How long does it take for a complete movement (swing from vertical then hack-and-forth back to vertical) of the upper arm? :5 (c) At what times during the rst complete cycle (including the endpoints) is the upper arm in the vertical position? (Enter your answers as a commaseparated list. Round your answers to two decimal places.) t: s