

I'm just not able to understand how they got from where they substituted a subscript n after the second equals to sign from 5.27 to x(A(x))^2
Any help would be much appreciated.


I'm just not able to understand how they got from where they substituted a subscript n after the second equals to sign from 5.27 to x(A(x))^2
Any help would be much appreciated.
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