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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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
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.
not really u changed the question while i took it from a very reliable source
This is what you posted:Quote:
Originally Posted by abdulrehmanshah
And the give answer is wrong.
Quote:
Originally Posted by abdulrehmanshah
I agree with MarkFL2. I'd check that "source" again if I were you ...
ok the answer can be wrong but how can u change the limits provided by question can anyone help solving
when a substitution is done, one may "reset" the limits of integration from x-values to u-values ...Quote:
Originally Posted by abdulrehmanshah
for,
for,
therefore ...
this is the correct answer and as stated by my book so what is that is wrong about this question
LOOK at your "answer" again ...Quote:
Originally Posted by abdulrehmanshah
http://mathhelpforum.com/attachments...lp-1111111.jpg
where did the e^x in the numerator go i know that lnu= 1/u but where did e^x go?
I don't know what your book gave but you posted the answer asQuote:
Originally Posted by abdulrehmanshah
. Since this is a definite integral there should be no "x" in the answer. The correct answer is, as skeeter said,
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
