Question

Determinati argumentele urmatoarelor numere complexe :
a)cos π/4-i sin π/4
b)-cos π/6+ i sin π/6

Answer 1

a)Notezi  numarul  cu  z.Argumentul  redus argz=Ф
Rez>0  Imz<0 =>argz=Ф ∈cadran 4
Ф=argz=2π-π/4=7π/4
Argz={7π/4+2kπ/ k∈Z}
b)argumentul  redus Ф
Rez<0 . Imz>0  Ф=argz∈cadranul 2
argz=Ф=5π/6
Argz={5π/6+2kπ}