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Question Number 39204 by math khazana by abdo last updated on 03/Jul/18

s t u d y t b e v a r i a t i o n o f f (x) = (2 x + 1) l n (1 + e^{- x})

a n d g i v e i t s g r a p h

2) c a l c u l a t e \int_{0}^{4} f (x) d x .