(-a^m-1)^3*(a^2)^1-n(a-b)^2*(a-b)^4+(b-a)^3(a-b)^3
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(-a^m-1)^3*(a^2)^1-n(a-b)^2*(a-b)^4+(b-a)^3(a-b)^3
(-a^m-1)^3*(a^2)^1-n
(a-b)^2*(a-b)^4+(b-a)^3(a-b)^3
(-a^m-1)^3*(a^2)^1-n(a-b)^2*(a-b)^4+(b-a)^3(a-b)^3
(-a^m-1)^3*(a^2)^1-n
=-a^3m-3*(a^2-2n)
=-a^3m-2n-1
(a-b)^2*(a-b)^4+(b-a)^3(a-b)^3
=(a-b)^6+[-(a-b)]^3(a-b)^3
=(a-b)^6-(a-b)^6
=0