(m³-n³)²-(m³+n³)(m³-n³)

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(m³-n³)²-(m³+n³)(m³-n³)
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(m³-n³)²-(m³+n³)(m³-n³)
(m³-n³)²-(m³+n³)(m³-n³)

(m³-n³)²-(m³+n³)(m³-n³)
(m³-n³)²-(m³+n³)(m³-n³)
=m^6-2m^3n^3+n^6-m^6+n^6
=2n^6-2m^3n^3
=2n^3(1-m^3)