1. (a) Find all the critical numbers of f(=v) = 3+ since) in the interval [0, 3a]. (b) Draw the graph of f (2:) on the interval [0, Sir]. For this function on this interval, identify all the points (:3, y) where f has a local minimum, global minimum, local maximum, or global maximum. What are the global minimum value and global maximum value of f on [0,31r]