The second derivative of the function ff is given by f′′(x)=sin(x28)−2cosxf″(x)=sin(x28)−2cosx. The function ff has many critical points, two of which are at x=0x=0 and x=6.949x=6.949. Which of the following statements is true?

C: f has a local maximum at x=0x=0 and a local minimum at x=6.949x=6.949.

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