For the function [math], find all intervals where the function is increasing: [math] is increasing on
(Give your answer as an interval or a list of intervals, e.g., (-infinity,8] or (1,5),(7,10) .)

Similarly, find all intervals where the function is decreasing: [math] is decreasing on
(Give your answer as an interval or a list of intervals, e.g., (-infinity,8] or (1,5),(7,10) .)

Finally, find all critical points in the graph of [math]
critical points: [math]
(Enter your [math]-values as a comma-separated list, or none if there are no critical points.)