# Integral of 2/((e^(-x))+1)

## Homework Statement

integral of 2/((e^(-x))+1)

## Homework Equations

how do you do this?

## The Attempt at a Solution

no freaking clue! this is the BS i came up with

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

You can rewrite the integrand and then use a simple substitution. Hint: multiply the numerator and denominator by e^x and then simplify.

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You can rewrite the integrand and then use a simple substitution. Hint: multiply the numerator and denominator by e^x and then simplify.

so then...i want to find the integral of e^x/(e^x + 1)...and i think i want to use substitution? u = e^x + 1. but then i do something wrong somewhere...i'm getting retarded answers...

Cyosis
Homework Helper
If $u=e^x+1$ then du=?