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Question: how to get the first function acting on an expression out of many functions in series?

Question:how to get the first function acting on an expression out of many functions in series?

Rohith 65 Maple
September 20 2018
1

how can I get the first function acting on the symbolic expression as below(in this case log)

expr :=sin(abs(log(a+b*c)));


I need to solve for many unknown expressions. It would be great if I can able to get all functions in sequential order acting.

I got to know using op i can solve if only one function is action like below

expr := sin(a+b*c)
then op(0,expr) #gives sin

op(1,expr) # gives a+b*c


Thank you
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