- #1

- 2

- 0

## Homework Statement

before we start, i don't know how to do the integral sign, so we'll use [

I need to integrate

[ e^(-3x) / 1 + e^(-3x)

## Homework Equations

I've always had trouble with doing integration with e

## The Attempt at a Solution

I used u=1+e^(-3x)

du = -3e^(-3x)

so du/3 = e^(-3x)

I then do

(1/-3) [ u and i end up with the answer 1/-3 (1+e^(-3x)) + c

answer that i am supposed to get is

-1/3ln|1 + e^(-3x)| + C