calcul littéral (3.2j-4)(4-3.2j)
(3.2j-4)(4-3.2j) = (-4+3.2j)(4-3.2j)= -(4-3.2j)(4-3.2j)
= -( 16 - 25.6j + 10.24 j*j ) | j*j = -1
=- ( 16 - 25.6j -10.24 )
=- ( 5.76 - 25.6 j )
= - 5.76 + 25.6 j
