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April 21, 2026, 03:42:39 am
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Author Topic: integration/diff extension  (Read 3240 times)  Share 

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Martoman

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Re: integration/diff extension
« Reply #15 on: May 04, 2010, 10:36:04 pm »
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Quote from: /0 on May 04, 2010, 10:10:44 pm
Quote from: Martoman on May 04, 2010, 04:44:45 pm
Quote from: /0 on May 04, 2010, 11:51:15 am
Another way:



Another way:



The cosec one is perhaps the biggest leap of faith I have ever seen. :S





That's what I think too. I don't know why it's so standard - 90% of textbooks give that solution.

Standard? Jeez... i'd like to see that on  multi-choice exam 2, that would be hell fun.
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TrueTears

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Re: integration/diff extension
« Reply #16 on: May 04, 2010, 11:04:16 pm »
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or just reduce it

but anyway its an assumed integral in exams
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Mao

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Re: integration/diff extension
« Reply #17 on: May 05, 2010, 01:23:20 am »
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Quote from: TrueTears on May 04, 2010, 11:04:16 pm
or just reduce it

but anyway its an assumed integral in exams

What exams?
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TrueTears

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Re: integration/diff extension
« Reply #18 on: May 05, 2010, 02:15:25 am »
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in vcaa exams, when i did them and i saw int cosecx dx as part of an integral i never did working to show the integral, i just assumed the integral was a result, never got any marks taken off
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Mao

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Re: integration/diff extension
« Reply #19 on: May 05, 2010, 02:29:10 am »
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Quote from: TrueTears on May 05, 2010, 02:15:25 am
in vcaa exams, when i did them and i saw int cosecx dx as part of an integral i never did working to show the integral, i just assumed the integral was a result, never got any marks taken off

I can't say I understood what you meant, but sure.
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TrueTears

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Re: integration/diff extension
« Reply #20 on: May 05, 2010, 02:33:44 am »
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lol shit i just reread it myself and it didnt make sense, argh im bad at english dono how to express myself, i just mean like i never showed int cosecx dx = ln(|sinx|/(cosx+1)|), if it were part of another integral, i'd just write the result for the integral of cosecx, same goes for sec
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tram

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Re: integration/diff extension
« Reply #21 on: May 05, 2010, 07:00:04 pm »
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reli? wow, i thought the only assumed integrals were the one on the formuls sheet, thought for everything else, you had to show full working
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Mao

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Re: integration/diff extension
« Reply #22 on: May 06, 2010, 12:10:33 am »
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Ahh, right, that's what you mean. TT meant when he encounters or things like that, he does not evaluate it and just leaves it in the integral form as .
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tram

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Re: integration/diff extension
« Reply #23 on: May 06, 2010, 10:00:32 am »
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oh gotcha:) hmmmmm are you sure ur allowed to do that?
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