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Question: How to define a function where one input is the sum of variables?

Question:How to define a function where one input is the sum of variables?

fabs 10 Maple 2022
February 14 2024
1

I am trying to define a function f(x1+tau,x2)= (x1+tau)*a+x2*b. I need this to be able to take derivations w.r.t. the sum (x1+tau) and to only tau as well. Is there a way to do this?
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