(-2m^2n^2)^3+8(m^2)^3(-m^2)(-n)^3

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(-2m^2n^2)^3+8(m^2)^3(-m^2)(-n)^3
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(-2m^2n^2)^3+8(m^2)^3(-m^2)(-n)^3
(-2m^2n^2)^3+8(m^2)^3(-m^2)(-n)^3

(-2m^2n^2)^3+8(m^2)^3(-m^2)(-n)^3
(-2n^2)^3+8(m^2)^3(-m^2)(-n)^3
=-8m^6n^6+8m^6m^2n^3
=-8m^6n^3(n^3-m^2)