Consider the function f x 8 cos x on 27 27 Its derivative is f x help formulas The graph that correctly displays f x in black and f x in orange is OA OB OC OD A B NA NA AA WAR D 6 20315 4 2013 Using the graphs of f and f indicate where f is increasing and decreasing Enter DNE if such an interval does not f is increasing on help intervals C 2019