Question 1167491
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            This statement is   INCORRECT.




Counter-example:  consider    {{{z[1]}}} = 1,    {{{z[2]}}} = i.


Then   arg ({{{z[1]+z[2]}}}) = {{{pi/4}}};      arg ({{{(z[1]+z[2])^2}}}) = {{{pi/2}}}    and the equality fails.



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