Compute
(del)/(delx)f(x,y)
and
(del)/(dely)f(x,y)
for each of the following functions (a)
\mu (r,\phi )-r^(2)-r^(4)\phi 2\phi -3
(b)
f(x,y)=xln(y^(2)) 2sinx
(c)
f(x,y)=x y y^(2)e^(x)
