Carol H. answered 12/01/17
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(m2 - n2m)2 - 2m3n2 =
(m2 - n2m)(m2 - n2m) - 2m3n2 =
m4 - m3n2 - m3n2 + m2n4 =
m4 - 2m3n2 + m2n4