[tomo876]

hmm i know that:

∫ xcos2x

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

but then it asks, "Use your answer to find

∫x(cos^2)x

any help would be much appreciated

[raheem94]

(Original post by tomo876)
hmm i know that:

∫ xcos2x

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

but then it asks, "Use your answer to find

∫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.

[raheem94]

(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.

[Brit_Miller]

(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.

[raheem94]

(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.

[Brit_Miller]

(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.

[tomo876]

Thanks guys, exam is a week on Wednesday! But I'm much more worried about s2 than c4 haha