Find the critical points of f(x) = -6x4 + 2x² - 8 and apply the Second Derivative Test (if possible) to determine whether each of them corresponds to a local minimum or maximum. (Use symbolic notation and fractions where needed. Give your answer in the form of a comma separated list. Enter DNE if there are no critical points.) the critical points with a local minimum at x = the critical points with a local maximum at x =

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