The force F (in pounds) on a person's back when he or she bends over at an angle 0 from an upright position is modeled by 0.6W sin(0 + 90) sin(129) where W represents the person's weight (in pounds). (a) Simplify the model. F=> (b) Use a graphing utility to graph the model, where W 125 and 0 0 90. At what angle (in degrees) is the force maximized? b=0 At what angle (in degrees) is the force minimized? too