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Question: Partial derivative of multivariable function using maple

Question:Partial derivative of multivariable function using maple

ASchleck 15 Maple
sum differentiation diff
June 01 2017
1

Problem.mw

Hi,

I want to know the partial derivative of

where

in order to 

ρ

If I write 

I obtain this

 

which is incorrect  since I did not have any indexes in sigma. However if I do this next command the result seems correct although no substituion of rhocrf

What I would like to obtain was the solution in order to rho and not to rhocrf and additionally having the result as a summation over p and q and not the extended result. How should I write it in Maple then? 

 

Thank you very much!
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