Question: Defining dependant variable with respect to two independent variables

 

If I have this dependant variables u which depend on (x & y)  if I want to differentiate u with respect to x I have to write diff(u(x,y),x).

Now how to tell maple in on time that every u is a function of (x & y), hence I need to write just diff(u,x).

 

With many thanks in advance

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