The second derivative of the function f is given by f" (x) = esin z (2 cos x – x sin x + xcos?x). The function f has many critical points, two of which are at x = 2.074 and x = 7.980. Which of the following statements is true? (A) f has local minima at x = 2.074 and at x = 7.980. f has a local minimum at x = 2.074 and a local maximum at x = 7.980. f has a local maximum at x = 2.074 and a local minimum at x = 7.980. f has local maxima at a = 2.074 and at x = 7.980.

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