Question: Show that if R e z 1 > 0 and R e z 2 > 0 , then Arg ( z 1 z 2 )

Show that if Rez1>0 and Rez2>0, then
Arg(z1z2)=Argz1+Argz2,
where principal arguments are used.
Show that if Rez1>0 and Rez2>0, then Arg(z1z2)=Argz1+Argz2, where principal arguments

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