HSC Stuff > HSC Mathematics Extension 2

Integration by Parts Method

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frog1944:
Hi,

When evaluating an integral using integration by parts, is it required for you to write, u = ..., dv = .... etc. Or can you do that in your head or just jot it down on the side of the page in a less formal manner?

Thanks

jakesilove:

--- Quote from: frog1944 on April 29, 2017, 03:12:40 pm ---Hi,

When evaluating an integral using integration by parts, is it required for you to write, u = ..., dv = .... etc. Or can you do that in your head or just jot it down on the side of the page in a less formal manner?

Thanks

--- End quote ---

Whilst I don't think it's required that you write out that information, I would strongly recommend that you do. If you do it in your head, you're more likely to make a mistake. Alternatively, if you do mess up your calculation somewhere, you're more likely to receive working marks if you've shown the correct steps. I get that writing out the integration by parts method can be tedious, especially when you've done the same integral so many times. However, I would seriously recommend getting into the habit of doing it everytime!

RuiAce:
Personally I stopped writing it out after just doing about a week of them.

But I've seen a ton of scenarios where people mess up doing it inside their head. So do whatever you feel is safest for you.

frog1944:
Ok, thanks guys :)

jamonwindeyer:

--- Quote from: RuiAce on April 29, 2017, 04:10:06 pm ---Personally I stopped writing it out after just doing about a week of them.

But I've seen a ton of scenarios where people mess up doing it inside their head. So do whatever you feel is safest for you.

--- End quote ---

I still mess it up doing it in my head in third year lol

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