Find the first partial derivatives of

http://webwork.math.ucdavis.edu/webw...83f9fb52f1.png at the point http://webwork.math.ucdavis.edu/webw...74278dd1a1.png.

http://webwork.math.ucdavis.edu/webw...262d7242d1.png

http://webwork.math.ucdavis.edu/webw...fbfc85efe1.png