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# FP2 watch

1. How should I integrate for the last question?

It's only for two marks, so I assume that they expect me to do this by inspection by I can't seem to find a way?
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2. (Original post by pleasedtobeatyou)
How should I integrate for the last question?

It's only for two marks, so I assume that they expect me to do this by inspection by I can't seem to find a way?
You're supposed to spot that the integrand is what you get if you differentiate something using the chain rule.
3. (Original post by pleasedtobeatyou)
How should I integrate for the last question?

It's only for two marks, so I assume that they expect me to do this by inspection by I can't seem to find a way?

Use the chain rule in reverse

Pleased to help you
4. (Original post by Smaug123)
You're supposed to spot that the integrand is what you get if you differentiate something using the chain rule.
(Original post by Indeterminate)

Use the chain rule in reverse

Pleased to help you

Thanks to both of you but why isn't this question worthy of more than three marks?

EDIT: Two marks even!
5. (Original post by pleasedtobeatyou)
Thanks to both of you but why isn't this question worthy of more than three marks?

EDIT: Two marks even!
This is just a (u) substitution, I'm not sure why its more then 1 mark?
6. (Original post by Zilch)
This is just a (u) substitution, I'm not sure why its more then 1 mark?
Ahh yes that's a better idea

I did think that the examiners were asking a bit too much to recognise a chain rule in reverse for just two marks
7. (Original post by pleasedtobeatyou)
Ahh yes that's a better idea

I did think that the examiners were asking a bit too much to recognise a chain rule in reverse for just two marks
Hmm, I'd have thought spotting the relevant substitution would be harder. I find it's easier to integrate df/dx than it is to spot a substitution… and when it comes to differential equations, it's much much easier.
8. (Original post by pleasedtobeatyou)
Ahh yes that's a better idea

I did think that the examiners were asking a bit too much to recognise a chain rule in reverse for just two marks
Remember always to look for that first. That's the first thing my prof told me when I started math at uni. You learn so many different ways of integration later on that are harder which makes you think of (u) substitutions like the holy grail. Always makes life easy if you find one so thats the first thing you look for.

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