Use the given graph of f over the interval (0, 6) to find the following. 1- 1 (a) The open intervals on which f is increasing. (Enter your answer using interval notation.) (1,3) U (4,6). (b) The open intervals on which f is decreasing. (Enter your answer using interval notation.) (0,1) U (3,4)| (c) The open intervals on which f is concave upward. (Enter your answer using interval notation.) (-0,3) (d) The open intervals on which f is concave downward. (Enter your answer using interval notation.)

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