SKEDSOFT
Problems Maxima And Minima of Function of Two Variables-1:
3. Find the extreme value of the functions x3 y3 - 3xy.
Solutions: Let
Elimminating y we get;
The critical point are (0,0) and (1,1)
Hence there is neither a maximum nor minimum at (0,0)
Also minimum 
4. Examine the function f (x,y) 
for extreme.
Solutions: Let
