Find the critical points e for the function f and apply the Second Derivative Test (if possible) to determine whether each of these points corresponds to a local maximum (Cmax ) or minimum (Cmin). S(x) = 9x' In(5x) (x > 0) (Use symbolic notation and fractions where needed. Give your answer in the form of a comma separated list, if necessary. Enter DNE if there are no critical points.) Cmin = Cmax =

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