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Question: Functional programming: Why is this indexed function call not working

Question:Functional programming: Why is this indexed function call not working

C_R 2592 Maple
June 16 2024
0 
expr:=cos(x)^2;
expr=combine[trig](expr);
(x->x=combine[trig])(expr);

Update:
Same outcome with

expr=`combine/trig`(expr);
(x->x=`combine/trig`)(expr);
                          2   1            1
                    cos(x)  = - cos(2 x) + -
                              2            2

                           2               
                     cos(x)  = combine/trig
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