Find the points of inflection of the graph of the function. (If an answer does not exist, enter DNE.)
f(x) = 2 sin x + 2 cos x, [0, 24]
(x, y) = (4.0
(smaller x-value)
(x, y) = (0
(larger x-value)
Describe the concavity. (Enter your answers using interval notation.)
concave upward
DNE
concave downward

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