First time maple user here,

I have a set of equations, as follows

where u,v,w are all differentiable w.r.t. x,y,z. I want to evaluate the partial derivative of each of these three expressions w.r.t. x,y,z.

For example,  (this is supposed to be a partial derivative)

When I try epsilon = diff(uo, x), i get this 

which is evaluating u as a constant but not giving me 

when I try using convert((D(uo))(x), diff), I get 

which doesn't know that 

How can I evaluate these expressions appropriately?

Any help will be greatly appreciated!