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Question: Change the setting order of the '+' sign befor '-'

Question:Change the setting order of the '+' sign befor '-'

ControlLaw 40 Maple
sort sign
April 28 2023
2

Hello, 
I have an simple exmple of expresion : 

restart;
v1 := sin(c)*sin(a)(a - b);
                  v1 := sin(a)(-b + a) sin(c)

v2 := sin(c1)*sin(a1)(-a + b);
                 v2 := sin(a1)(-a + b) sin(c1)

sort(v1);
                      sin(c) sin(a)(a - b)

sort(v2);
                    sin(c1) sin(a1)(-a + b)


what i want  is :  sort(v2); --->     sin(c1) sin(a1)(b-a)

That mean i want the "+" sign comme alwase first

Merci
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