ATAR Notes: Forum
HSC Stuff => HSC Maths Stuff => HSC Subjects + Help => HSC Mathematics Extension 2 => Topic started by: frog1944 on April 29, 2017, 03:12:40 pm
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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
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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
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!
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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.
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Ok, thanks guys :)
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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.
I still mess it up doing it in my head in third year lol
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Im pretty sure you would get marks too if you wrote it down.
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I still mess it up doing it in my head in third year lol
Ouch...
But yeah, I never wrote my u's and dv's. And I always got marks for it.