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Questions 9,12,15 9-14 (a) Find the intervals on which f is increasing or decreasing. (b) Find the local maximum and minimum values of f. (c)

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Questions 9,12,15

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9-14 (a) Find the intervals on which f is increasing or decreasing. (b) Find the local maximum and minimum values of f. (c) Find the intervals of concavity and the inflection points. 9. f(x) = x3 - 3x2 - 9x + 4 10. f(x) = 2x3 - 9x2+ 12x -3 11. f(x) = x4 - 2x2+ 3 12. f (x) = x2 + 1 13. f(x) = sin x + cos x, 0

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