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Efectuati
(1+i)^4+(1-i)^4


Răspuns :

(1+i)^4=(1+2i-1)^2=(2i)^2=4*(-1)=-4
(1-i)^4=(1-2i-1)^2=(-2i)^2=4*(-1)=-4

Deci (1+i)^4+(1-i)^4=-4-4=-8.