- #1

menco

- 43

- 0

## Homework Statement

(e^-x)/(1+e^-x)dx

## Homework Equations

Integral of e^x function

## The Attempt at a Solution

I am completely lost with the problem, the fact that it is e^-x and not e^x has me stupped as well as the division.

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- Thread starter menco
- Start date

- #1

menco

- 43

- 0

(e^-x)/(1+e^-x)dx

Integral of e^x function

I am completely lost with the problem, the fact that it is e^-x and not e^x has me stupped as well as the division.

- #2

foxjwill

- 354

- 0

Try [itex]u[/itex]-substitution.

- #3

menco

- 43

- 0

so if I let u=1+e^-x?

- #4

Dickfore

- 2,988

- 5

yes?

- #5

foxjwill

- 354

- 0

so if I let u=1+e^-x?

Well, does it work?

- #6

menco

- 43

- 0

I still cant figure it out so I gave up and will try again later

- #7

foxjwill

- 354

- 0

I still cant figure it out so I gave up and will try again later

When you do get back to it, answer this: What is [itex]du[/itex] when [itex]u=1+e^{-x}[/itex]?

- #8

menco

- 43

- 0

Will du = -e^-x dx

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