



 
Nazrul, Yes, because the equality relation is symmetric But note that neither of the first two expressions is true for ALL values of p,a,q,n ; they are not tautologies like x^{2} a^{2} = (x+a)(xa), but "predicates": statements about the variables which may be true or false. In order to be able to draw the conclusion you do, you must have values in mind for p,a,q,n for which both the original equations hold. Good Hunting!  


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