Math Log problems

1. The problem statement, all variables and given/known data



1. I have to prove that x+ln(1+e^(-x)) is equal to ln(1+e^(x))



2. Relevant equations





3. The attempt at a solution

1. x+ln(1+e^(-x)) =ln(1+e^(x))

ln(e^(-x)+1)+x

ln(1/(e^x)+1)+x



Im blocked here.. :(



thanks

Math Log problems