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c3 intergration help watch

1. I don’t understand question four:

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2. (Original post by alevel.student99)
I don’t understand question four:
Do it by parts. Or if you can think of a very obvious substitution, use that to lessen the work.
3. (Original post by RDKGames)
Do it by parts. Or if you can think of a very obvious substitution, use that to lessen the work.
i've tried both but i have a massive feeling i'm doing it all wrong, i'll post my workings one sec

4. the first half i tried to do it by parts but it looks wrong,

the second half is my attempt at substitution
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5. (Original post by alevel.student99)

the first half i tried to do it by parts but it looks wrong,

the second half is my attempt at substitution
By parts looks good, except you goes to

The latter integral can be done by substitution

Spoiler:
Show

The very same substitution you could've done at the very start of the question.

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