23-28 (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. 24. f(x) = 26. f(x) = x² In x 23. f(x) = 2x² + 3 14 X - 25. f(x) = x² - x - ln x 27. f(x) = xe? 28. f(x) = cos²x - 2 sin x, 0≤x≤ 2T X

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