primitive de 1/1+e^x

astuces pour les primitive

[@maxblanc1934]

I find it funny that you can find an alternative expression to this integral
As if you multiply both the numerator and the denominator by exp(x)
Then you find something like
ln|e^x + 3/2| - ln|e^x| + C

[@minpolink]

Not sure how you do that cause the answer is wrong.
Though if you multiply both the numerator and the denominator by exp(-x)
you can find -ln(1+exp(-x)) + C

[@evasamoun532]

primitive et pas intégrale il me semble

[@mathsbekk3801]

c'est juste merci