(-2+m^2)(4+m^4+2m^2)=
=-8-2m^4-4m^2+4m^2+m^6+2m^4=
=-8+m^6
(m²-2)(+2m²+4)=+2+4m²-2-4m²-8=-8
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(-2+m^2)(4+m^4+2m^2)=
=-8-2m^4-4m^2+4m^2+m^6+2m^4=
=-8+m^6
(m²-2)(
+2m²+4)=
+2
+4m²-2
-4m²-8=
-8