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z=-2+2i forma trigonometrica

Răspuns :

z=2(-1+i)
-1+i=?
modul =√((-1)²+1²)=√2
 teta =arctg(1/(-1))=-π/4=π-π/4=3π/4

-1+i=√2(cos 3π/4+isin 3π/4)

z= 2*√2(cos 3π/4+isin 3π/4)