Question: partial derivatives

Hi all,

I need to obtain the partial derivative of the following functional, with respect to "a" and "b":

for example, diff(p(a(t),b(t)), a) or diff(p(a(t),b(t)), b)

I am using Maple 12, but it returns 0 while using the above command. Does anybody know how to enter the correct commands?

Thank you in advance,



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