You made it difficult for yourself. When you get to this stage:
You can cancel the 2s and rewrite, as I had:
Which is easier to work with.
Anyway, what's the answer to your original question, which was:
? You don't have to work anything else out. Use these two facts:
Thanks all
this is my full solution:
Sorry for reposting it all but in case anyone else wanted to follow the full solution-(i am sure to confuse them otherwise)
Your time is appreciated
Hopefully i did not make anymore mistakes!
thanks
John
Integrate by parts;
Substituting
Need to solve the integral of 2x.Cos2x by parts:
Substitute back in;
Now substitute this integral back into equation (1)
thanks Quacky
appreciate the help
I am working on another one now that has an Lnx term in it-it seems to be repeating itself over and over-no thought there is a simple solution -i may well have to post about it though....keep the eyes peeled!
John
Hi Quacky,
If the function is
it repeats and repeats.
Now if i make
Then i need to integrate the term to get v.
however if integrate it by parts and make
and
then it repeats over and over.
However if i make:
and
then i can get a solution fairly easily.
Is it ok to rearrange the and the to suit ?
Do i need to post this as a different thread?
regards
John
Sorry to butt in, but, just in case a picture helps...
Not so.
... where (key in spoiler) ...
Spoiler:
_________________________________________
Don't integrate - balloontegrate!
Balloon Calculus; standard integrals, derivatives and methods
Balloon Calculus Drawing with LaTeX and Asymptote!