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Question: Error, invalid input

Question:Error, invalid input

gsb 5 Maple 18
syntax diff
April 04 2015
1

I have the following functions: and 

I want to differentiate e(a,A) wrt A and I keep getting the following error

Error, invalid input: ln expects its 1st argument, x, to be of type algebraic, but received [gamma/(c(A)^(sigma*phi)-1+gamma)].

Not sure how to proceed.

Thanks in advance for your help.

 
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