1. :1} Find all four critical points for the inction rm", 3;] = if" + $23; + 911,:2 + 2-132. b) The critical points for the function f{:i':, y} = 3:3 + my? + 62:2 + 9'2 are (1.3), (1, 3}, (4,0} and (0, 0}. Use the Second Derivative 'l'cst to classify each one as local max. local min or saddle point