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(m²+n²+(m²-n²)) (m²+n²-(m²-n²))=36
(m²+n²+m²-n²)(m²+n²-m²+n²) = 36
(2m²)(2n²) =36 ; aplicando raiz cuadrada a ambos miembros:
√(4m²n²) = √36
2mn = 6
mn = 3