ANSWER :-
Let D = {zC| |z|<1}denote the open unit disc.
And also given that f : D C be a homorphic function.
Let us suppose that for any integer n>1 we have that
.................................................................................(1)
Here we need to show that:-
From equation (1) we already know that
where ...........................................................(2)
Therefore .
Hence proved.
Thank you
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