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Applying the First Derivative Test In Exercises 17-40, (a) find the critical numbers of f (if any), (b) find the open interval(s) on which the function is increasing or decreasing, (c) apply the First Derivative Test to identify all relative extrema, and (d) use a graphing utility to confirm your results.33. f(x) = 2x + 35. f(x) - 9 r- - 2r + 1 36. f(x) x+1