Find all critical points of f Classify each critical point o
       Find all critical points of f.  Classify each critical point of f as a local max, a local min, or saddle point.   
  
  Solution
https://drive.google.com/open?id=0B2XEvx_GW13bNjlxYWJmWm1vSEk
https://drive.google.com/open?id=0B2XEvx_GW13bNmZhZTRsUG1JWTA
https://drive.google.com/open?id=0B2XEvx_GW13bRE52Q19wX2tXdWM
https://drive.google.com/open?id=0B2XEvx_GW13bNGJ0Vkg0NUJkUkU

