Activity
1.  You are given a function f  defined and differentiable on a closed interval [a, b]. Describe the steps you would use to find global extrema.
2.  You are given a function f  defined and continuous on an open interval (a, b). Describe the steps you would use to find global extrema.
3.  You are given a function f  defined but not continuous on an open interval (a, b). Describe the steps you would use to find global extrema.