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September 24, 2025, 06:24:12 pm
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Author Topic: Anti-Diff by Recognition  (Read 3377 times)  Share 

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wildareal

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Anti-Diff by Recognition
« on: July 12, 2010, 01:43:36 pm »
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Hi There,

Find the derivative of f(x)=xe^(-x) and hence find the integral of xe^(-x).

Thanks
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brightsky

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Re: Anti-Diff by Recognition
« Reply #1 on: July 12, 2010, 01:52:35 pm »
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Integrate both sides:



As :





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TrueTears

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Re: Anti-Diff by Recognition
« Reply #2 on: July 12, 2010, 01:55:11 pm »
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although its not part of the question, i suggest you have a look at http://en.wikipedia.org/wiki/Integration_by_parts - very easy to understand and easily approachable by methods students who understand the product rule, this can enhance your understanding of why "antidiff by recognition" works, rather than mindlessly applying it.
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98.40_for_sure

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Re: Anti-Diff by Recognition
« Reply #3 on: July 12, 2010, 02:38:23 pm »
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How do you type in "maths language" on VN? like brightsky's post
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Re: Anti-Diff by Recognition
« Reply #4 on: July 12, 2010, 02:46:29 pm »
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Quote from: 99.95_for_sure on July 12, 2010, 02:38:23 pm
How do you type in "maths language" on VN? like brightsky's post

Check here. There's a bit of a learning curve to it though, but it's worth learning if you're expecting to post lots of questions on the maths board.
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the.watchman

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Re: Anti-Diff by Recognition
« Reply #5 on: July 12, 2010, 03:59:11 pm »
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Also, http://vcenotes.com/viki/index.php/Help:LaTeX is quite good for a comprehensive list of codes :)
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tram

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Re: Anti-Diff by Recognition
« Reply #6 on: July 12, 2010, 04:09:34 pm »
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out of intrest, how long did it take you guys to get used to latex? i know that i tried once, i failed miserably, and from then on have never used latex again.....
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the.watchman

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Re: Anti-Diff by Recognition
« Reply #7 on: July 12, 2010, 04:19:17 pm »
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Quote from: tram on July 12, 2010, 04:09:34 pm
out of intrest, how long did it take you guys to get used to latex? i know that i tried once, i failed miserably, and from then on have never used latex again.....

It doesn't actually take too long :)
I learnt the basics over a week or so, and have been refining it ever since :)
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tram

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Re: Anti-Diff by Recognition
« Reply #8 on: July 12, 2010, 04:22:06 pm »
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mmmmm ok i will TRY and start practicing.....is latex used in any other programs? i.e will i be able to use the same codes in other programs or will this reli only be useful for vn?
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the.watchman

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Re: Anti-Diff by Recognition
« Reply #9 on: July 12, 2010, 04:22:55 pm »
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Quote from: tram on July 12, 2010, 04:22:06 pm
mmmmm ok i will TRY and start practicing.....is latex used in any other programs? i.e will i be able to use the same codes in other programs or will this reli only be useful for vn?

LaTeX can be used with programs for creating documents like tests etc. :)
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brightsky

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Re: Anti-Diff by Recognition
« Reply #10 on: July 12, 2010, 05:06:49 pm »
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Hehe, I still fail at making cases and matrices... ;D
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the.watchman

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Re: Anti-Diff by Recognition
« Reply #11 on: July 12, 2010, 05:17:37 pm »
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Quote from: brightsky on July 12, 2010, 05:06:49 pm
Hehe, I still fail at making cases and matrices... ;D

Lol, same! :P
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TrueTears

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Re: Anti-Diff by Recognition
« Reply #12 on: July 12, 2010, 05:33:05 pm »
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Quote from: 99.95_for_sure on July 12, 2010, 02:38:23 pm
How do you type in "maths language" on VN? like brightsky's post
Quote from: tram on July 12, 2010, 04:22:06 pm
mmmmm ok i will TRY and start practicing.....is latex used in any other programs? i.e will i be able to use the same codes in other programs or will this reli only be useful for vn?

for both, seriously, latex is a great skill to have, it is the standard program to type up science documents and also in uni the very first project we had, we had to type up our work, for those that already knew how to use latex, it was a breeze.

personally, ive typed up every single uni maths assignment with latex (using texnic centre), looks pr0 and easy to use.
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Cthulhu

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Re: Anti-Diff by Recognition
« Reply #13 on: July 12, 2010, 05:48:54 pm »
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Quote from: TrueTears on July 12, 2010, 05:33:05 pm
Quote from: 99.95_for_sure on July 12, 2010, 02:38:23 pm
How do you type in "maths language" on VN? like brightsky's post
Quote from: tram on July 12, 2010, 04:22:06 pm
mmmmm ok i will TRY and start practicing.....is latex used in any other programs? i.e will i be able to use the same codes in other programs or will this reli only be useful for vn?

for both, seriously, latex is a great skill to have, it is the standard program to type up science documents and also in uni the very first project we had, we had to type up our work, for those that already knew how to use latex, it was a breeze.

personally, ive typed up every single uni maths assignment with latex (using texnic centre), looks pr0 and easy to use.
Every assignment I had handed in this year was "Nice use of LaTeX". Not even kidding.
Texnic Centre is the bomb. It's so pro for writing up lab reports or technincal rubbish because its so flexible(like your mum)
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TrueTears

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Re: Anti-Diff by Recognition
« Reply #14 on: July 12, 2010, 05:54:28 pm »
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Quote from: Cthulhu on July 12, 2010, 05:48:54 pm
Quote from: TrueTears on July 12, 2010, 05:33:05 pm
Quote from: 99.95_for_sure on July 12, 2010, 02:38:23 pm
How do you type in "maths language" on VN? like brightsky's post
Quote from: tram on July 12, 2010, 04:22:06 pm
mmmmm ok i will TRY and start practicing.....is latex used in any other programs? i.e will i be able to use the same codes in other programs or will this reli only be useful for vn?

for both, seriously, latex is a great skill to have, it is the standard program to type up science documents and also in uni the very first project we had, we had to type up our work, for those that already knew how to use latex, it was a breeze.

personally, ive typed up every single uni maths assignment with latex (using texnic centre), looks pr0 and easy to use.
Every assignment I had handed in this year was "Nice use of LaTeX". Not even kidding.
Texnic Centre is the bomb. It's so pro for writing up lab reports or technincal rubbish because its so flexible(like your mum)
bahahahaha, i rmb earlier this year i had to email an assignment to leo brewin, he replies with "excellent use of latex"
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