let f(x)=x arctan(1+e^(−x) ) developp f at intrgr serie .


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Question Number 34864 by a.i msup by abdo last updated on 12/May/18

$l e t f (x) = x a r c t a n (1 + e^{- x})$ $d e v e l o p p f a t i n t r g r s e r i e .$
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