Find the point of inflection of the graph of the function. (If an answer does not exist, enter DNE.) f(x) = x + 8 cos x, [0, 2л] (x, y) = (x, y) = x) (smaller x-value) *) (larger x-value) Describe the concavity. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) X concave upward

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