(m-n ) (m+n) (m+n) (m-n)
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Step-by-step explanation:
(m-n×m-n)(m+n×m+n)
=(m-n)²(m+n)²
=(m²+n²-2mn)(m²+n²+2mn)
=m²+n²-2mn+m²+n²+2mn
=2m²+2n²
=2(m²+n²)
hope it is helpful
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