Find the intervals where the graph is concave down (C.D.). Also find all inflection points (I.P.). Do not graph. f (x) = x? + 4 cos(x), 0 < x < 2n only O C.D. < x < , I.P. x = , x = 3 3 3 O C.D. 0 < x < 5, < x < 27, I.P. x = x = 3 3 3 3 O C.D. D < x < 2ñ, I.P. x = 3 57 3 3 O C.D. 0 < x < < x < 27 , I.P. x = , x = 3> 3 3 O C.D. 0 < x < 4, I 77 < x < 2n , I.P. x = , x = 6

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