how do i integrate

(cos x)^2 / (e^x) + 1

i tried integration by parts but that made it even harder and i can't seem to figure out any trig substitution, can this be integrated???

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- March 12th 2009, 03:05 PMrazorfeverhard integration
how do i integrate

(cos x)^2 / (e^x) + 1

i tried integration by parts but that made it even harder and i can't seem to figure out any trig substitution, can this be integrated??? - March 12th 2009, 03:11 PMiLikeMaths
do u mean

- March 12th 2009, 03:29 PMrazorfever
yes exactly that

- March 12th 2009, 03:49 PMiLikeMaths
use integation by parts where

- March 12th 2009, 04:30 PMrazorfever
can you be a bit more specific and write out every step

- March 12th 2009, 04:32 PMiLikeMaths
ok.. i will post it in about 10 mins, cos im still not used to using the LaTex math thing

- March 12th 2009, 04:54 PMrazorfever
this is the same answer as i got ... i thought it was wrong cause it seemed too big

now do you know how i can find the lim as x goes to infinity of this expression

this is involving a series problem in order to find the upper error bound and the remainder - March 12th 2009, 04:56 PMiLikeMaths
i differentiated the function instead of integrating

- March 12th 2009, 07:55 PMKrizalid