(2m-n)^2(n^2+4m^2)^2(2m+n)^2

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(2m-n)^2(n^2+4m^2)^2(2m+n)^2
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(2m-n)^2(n^2+4m^2)^2(2m+n)^2
(2m-n)^2(n^2+4m^2)^2(2m+n)^2

(2m-n)^2(n^2+4m^2)^2(2m+n)^2
(2m-n)^2(n^2+4m^2)^2(2m+n)^2
=(2m-n)^2(2m+n)^2(n^2+4m^2)^2
=(4m²-n²)²(4m²+n²)²
=(16m^4-n^4)²
=256m^8-32m^4n^4+n^8