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Question: supress expression.

Question:supress expression.

RK1 160 Maple
substitution simplification alias incomplete-question
August 24 2022
2

I have defined several expressions that keep coming up in my calculations. 
Like :

Delta := -2*M*r+a^2+r^2;
Sigma := (a^2+r^2)^2-Delta*a^2*sin(theta)^2;

Is it possible to make maple recognize these objects whenever they appear in the result of a calculation?
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