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NOTE: When using interval notation in WeBWork, remember that: You use 'INF' for co and '-INF' for -co. And use 'U' for the union symbol. Enter DNE if an answer does not exist. f(x) = 5 sin(x) cos(x) on (-7, T) a) Find the critical numbers of f (Separate multiple answers by commas.) b) Determine the intervals on which f is increasing and decreasing. f is increasing on: f is decreasing on: c) Use the First Derivative Test to determine whether each critical point is a relative maximum, minimum, or neither. Relative maxima occur at c = (Separate multiple answers by commas.) Relative minima occur at ~ = (Separate multiple answers by commas.)Find the critical numbers of the function 9(3) = 245' tan{t?} where 1r