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PostPosted: Sat Feb 07, 2004 11:27 am 
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Location: London, Ontario
Ridseard wrote:
du=-sin(exp(t))exp(t)dt
v=t

So integral[cos(exp(t))dt]= tcos(exp(t)) - integral[texp(t)(-sin(exp(t)))dt
= tcos(exp(t)) + integral[texp(t)sin(exp(t))dt]


Unless I'm badly mistaken this means we're now living in the End Times. I think it also proves the Big Twang theory.

Steve


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PostPosted: Sat Feb 07, 2004 11:40 am 
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I used to like math too... then I got to university Calculus...

Oh my.....


and I have to have four of them.. (and I have been told by a reliable souce that the next (and last) is the hardest undergrad calc course on campus)

That is impressive because I am in electrical engineering, not math.


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PostPosted: Sat Feb 07, 2004 11:56 am 
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Math... :o I will always admire people like Ridseard (and Ants) who can do it well. I barely made it through Algebra. It was very frustrating. For example, in highschool, my tutor would show me how to factor. I would understand it perfectly for a moment. Then when I tried to do it on my own I would be completely unable. Even if it was like 2 minutes after it was shown to me. I would probably be in the same camp as Emmline.


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PostPosted: Sat Feb 07, 2004 12:34 pm 
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Well...there's math competence, ie, the ability to compute change, figure tips, solve basic geometric/algebraic type problems...as pass as much hs/college math as is necessary. I'm there. Then there's math fluency, which is, I believe, a comfort level with numbers and formulae similar to the comfort level I have with words and language. I do math by translating it into visual images...this often involves writing things down so I don't drop them from my head, then computing, then re-translating into numerals...a lengthy clunky process. Good mathematicians can think in numbers.

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PostPosted: Sun Feb 08, 2004 12:37 pm 
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SteveK you're just string..ing (theory) us along again aren't you.

Quote:


--------------------------------------------------------------------------------

I don't think parts will works because it gets nasty. Taking u=cos(exp(t)) and dv=dt,

du=-sin(exp(t))exp(t)dt
v=t

So integral[cos(exp(t))dt]= tcos(exp(t)) - integral[texp(t)(-sin(exp(t)))dt
= tcos(exp(t)) + integral[texp(t)sin(exp(t))dt]



Ridseard the above doesn't work in Tune-O-Matic on the Concertina website :D

MarkB

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