Question

Calculati
((1+i)/(1-i))^11

Answer 1

$(\frac{1+i}{1-i})^{11} =( \frac{(1+i)^2}{(1-i)(1+i)})^{11}=( \frac{2i}{2})^{11}=i^{11}=i^4*i^4*i^3=-i$