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9. Find all critical numbers of f (x) = x += 10. Use the closed interval method to find the absolute maximum and absolute minimum values of f(x) =3x4 -4x3 - 12x2 + 1 on [-2,3]. 11. Sketch a function on [0,6] that meets the following criteria: absolute maximum at x=1 . no absolute minimum . local maximum at x=4 has a local minimum at x=5