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Question: how to collect the terms of like powers of eta?

Question:how to collect the terms of like powers of eta?

WA573 80 Maple 2020
algebraic coefficients
September 28 2022
1

After substitution of (10) into (4), how to collect the terms of like powers of eta (i.e., eta^-3, eta^-2,eta^-1, eta^0, eta^1,eta^2 ), and equate the coefficients to
zero, get a system of algebraic equations for A[m]?

 

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