complex Numbers

The value of arg(i$ w $)+ arg (i$ w^2 $)=$ \pi +3 arg \omega  $
is
$ arg i=\frac{\pi}{2} $ $ arg \omega=\frac{2\pi}{3} $
$ arg z_1z_2=argz_1+arg z_2 $

I need quick answers please coz i'm having test ahead.

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