The force (in pounds) on a person's back when he or she bends over at angle (in degrees) is modeled by

where is the person's weight (in pounds).

a) Simplify the model.

Would it just be since ?

b) Use a graphing utility to graph the model, where and .

This is done.

c) At what angle is the force a maximum? At what angle is the force a minimum?

The angle is at a maximum at 0 and 360 degrees and minumum at 180 degrees. Does that seem right? Because at 180 degreesis negative.

I have also attached a picture of the original problem.