ind, if any, the local maximum and minimum values and the saddle point(s) of the function f(x,y) = (1/3)x3 - xy + (1/3)y3.  (Hint: find the critical points first, and then proceed.) I got the local max as DNE and the saddle point at (0,0). I think my math leading up to those was partially incorrect, because I got y= infinity.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Find, if any, the local maximum and minimum values and the saddle point(s) of the function f(x,y) = (1/3)x3 - xy + (1/3)y3.  (Hint: find the critical points first, and then proceed.)

I got the local max as DNE and the saddle point at (0,0). I think my math leading up to those was partially incorrect, because I got y= infinity. 

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