Attachment 26244this i tried to integrate by u substitution U=e^x+1 and then U-1/U after this i get U-lnU i dont know what do can anyone hint or help me solving it

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- Dec 15th 2012, 01:41 AMabdulrehmanshahlogarithm question need a slight help
Attachment 26244this i tried to integrate by u substitution U=e^x+1 and then U-1/U after this i get U-lnU i dont know what do can anyone hint or help me solving it

- Dec 15th 2012, 04:06 AMMarkFLRe: logarithm question need a slight help
Your substitution is good:

giving us:

Can you proceed from here?

Incidentally, the given answer is not quite correct.

By the way, I would post integration problems in the calculus forum. - Dec 15th 2012, 05:10 AMabdulrehmanshahRe: logarithm question need a slight help
not really u changed the question while i took it from a very reliable source

- Dec 15th 2012, 05:19 AMPlatoRe: logarithm question need a slight help
- Dec 15th 2012, 05:26 AMskeeterRe: logarithm question need a slight help
- Dec 15th 2012, 06:46 AMabdulrehmanshahRe: logarithm question need a slight help
ok the answer can be wrong but how can u change the limits provided by question can anyone help solving

- Dec 15th 2012, 06:56 AMskeeterRe: logarithm question need a slight help
- Dec 15th 2012, 07:03 AMabdulrehmanshahRe: logarithm question need a slight help
this is the correct answer and as stated by my book so what is that is wrong about this question

- Dec 15th 2012, 07:07 AMskeeterRe: logarithm question need a slight help
**LOOK**at your "answer" again ...

http://mathhelpforum.com/attachments...lp-1111111.jpg - Dec 15th 2012, 07:08 AMabdulrehmanshahRe: logarithm question need a slight help
where did the e^x in the numerator go i know that lnu= 1/u but where did e^x go?

- Dec 15th 2012, 07:10 AMHallsofIvyRe: logarithm question need a slight help
- Dec 15th 2012, 07:10 AMabdulrehmanshahRe: logarithm question need a slight help
ya i wrote it wrongly my bad the answer u got is the answer i have in the back of my note book can u please explain e^x part

- Dec 15th 2012, 07:13 AMskeeterRe: logarithm question need a slight help