Question

(PUC-RJ) Qual o valor de   ?

a 1/2 + 2i
b i
c 2i
d 1/2
e 1/2 + i

 

 

Answer 1

$\boxed{(\frac{\sqrt2}{2}(1+i))^2=\frac{2}{4}(1+2i-1)=\frac{1}{2}(2i)=i}$