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# Help on an integration question? :) Tweet

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1. Help on an integration question? :)
hmm i know that:

∫ xcos2x

= ((xsin2x)/2) + ((cos2x)/4)

∫x(cos^2)x

any help would be much appreciated
2. Re: Help on an integration question? :)
(Original post by tomo876)
hmm i know that:

∫ xcos2x

= ((xsin2x)/2) + ((cos2x)/4)

∫x(cos^2)x

any help would be much appreciated
Remember,

Now use the result of the previous part along with the new integration required.
3. Re: Help on an integration question? :)
(Original post by Brit_Miller)
Try integration by parts
Why integration by parts?

He already has the result of , so i don't see any reason for it.
4. Re: Help on an integration question? :)
(Original post by raheem94)
Why integration by parts?

He already has the result of , so i don't see any reason for it.
Ignore me, I read it wrong, I thought it looked like something you could use a reduction formula for but had already posted and you can't delete it.
5. Re: Help on an integration question? :)
(Original post by Brit_Miller)
Ignore me, I read it wrong, I thought it looked like something you could use a reduction formula for but had already posted and you can't delete it.
Posts can be deleted.

Just click on the edit button, you will see an option to delete.
6. Re: Help on an integration question? :)
(Original post by raheem94)
Posts can be deleted.

Just click on the edit button, you will see an option to delete.
Oh yeah, cheers, I didn't know that.
7. Re: Help on an integration question? :)
Thanks guys, exam is a week on Wednesday! But I'm much more worried about s2 than c4 haha