find the interval e^x (1+e^x)^2 dx

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- February 6th 2006, 10:19 PMkdstalnakerhelp please
find the interval e^x (1+e^x)^2 dx

- February 6th 2006, 10:48 PMCaptainBlackQuote:

Originally Posted by**kdstalnaker**

RonL - February 7th 2006, 03:04 PMThePerfectHackerQuote:

Originally Posted by**kdstalnaker**

.

Okay, call , then by substitution,

Thus,

Q.E.D. - February 7th 2006, 09:19 PMCaptainBlackQuote:

Originally Posted by**ThePerfectHacker**

not the same. Then look at my posting; its a hint. Differentiate what

I suggest and you will recover the integrand. So what does that tell

you about the integral?

RonL

RonL - February 8th 2006, 07:23 PMThePerfectHackerQuote:

Originally Posted by**CaptainBlack**

- February 8th 2006, 09:47 PMCaptainBlackQuote:

Originally Posted by**ThePerfectHacker**

and so is not the integral of

But:

and so is the integral of

RonL - February 9th 2006, 01:39 PMThePerfectHacker
Of course! Look at how I used substitution rule. I subsituted for instead of .