(1/4a^3+nb^m-1)^2·(4a^3+nb^m+1)^2

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(1/4a^3+nb^m-1)^2·(4a^3+nb^m+1)^2(1/4a^3+nb^m-1)^2·(4a^3+nb^m+1)^2(1/4a^3+nb^m-1)^2·(4a^3+nb^m+1)^2(

(1/4a^3+nb^m-1)^2·(4a^3+nb^m+1)^2
(1/4a^3+nb^m-1)^2·(4a^3+nb^m+1)^2

(1/4a^3+nb^m-1)^2·(4a^3+nb^m+1)^2
(1/4a^3+nb^m-1)^2·(4a^3+nb^m+1)^2
=1/16a^6+2nb^2m-2*16a^6+2nb^2m+2
=a^12+4nb^4m