J(x) 2 sin(x) +6 cos(x) on (-, ). Enter DNE if an answer does not exist. a) Give the domain of f (in interval notation): (intervals) b) Determine the intervals on which f is concave up/down: f is concave up on: f is concave down on: c) Based on your answers in (a) and (b), determine the inflection points of f: help (numbers) help (Each answer should be entered as an ordered pair, (x, y). Separate multiple answers with commas.) d) Find the critical numbers of f and use the Second Derivative Test, when possible, to determine the relative extrema. (Separate multiple answers Relative maxima occur at x= with commas.) Relative minima occur at x = commas.) (Separate multiple answers with e) Find the x-values where f'(x) has a relative maximum or minimum: f' has relative maxima at x = with commas.) f' has relative minima at x = with commas.) (Separate multiple answers (Separate multiple answers