(b) (i) Identify the critical numbers of f. (Enter your answers as a comma-separated list.) X = (ii) Identify the open interval(s) on which f is increasing or decreasing. (Enter your answer using interval notation.) increasing decreasing (iii) Determine whether f has a relative maximum, a relative minimum, or neither at each critical number. (Enter your answers as a comma-separated list.) relative minimum relative maximum

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