Find the point of inflection of the graph of the function. (If an answer does not exist, enter DNE.) f(x) = x + 6 cos x, [0,2] (x, y) = (x, y) = (smaller x-value) ) (larger x-value) Describe the concavity. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) concave upward concave downward