Entering partial derivatives?

[Gilles]

I agree with lrdheat. The prime's CAS is far more powerfull than the HP50G CAS for example, but for now the HP50G seems more homogenous in my opinion despite the lacks of his CAS.
Here is how to do for this with the 50G in RPL :



Note that the equation writer is unable to display the formula 2 and 4 on the stack in 'text book' (despite the fact that this syntax is well documented) but the way of the 50G to handle the paranthesis is more logical.