Answer to Question #50128 in Complex Analysis for Poll

Question #50128

Show That
This power series
∑ n from 2 to infinity of
[ (-1)^{n} . z ^{2n+3} ] = [ (z^{7} ) / (1+z{^2} ) ] ; |z| <1

Is power series ∑ n from 2 to infinity of
[ (-1)^{n} . i ^ {2ni} . i ^(3i) ] Convergent ? If yes ,Compute It's Sum

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