Ola FERNANDO

regra

i^(4k+0) = 1

i^(4k+1) = i

i^(4k+2) = -1

i^(4k+3) = -i

1) i² = -1, i¹³ = i, i²¹ = i

2)

6*(cos 7pi/4 + i sen 7pi/4) = 6*(√2/2 - i √2/2) = 3√2*(1 - i)

pronto