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November 09, 2025, 08:25:47 am
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Author Topic: Interesting questions (spesh)  (Read 12100 times)  Share 

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Martoman

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Re: Interesting questions (spesh)
« Reply #75 on: October 31, 2010, 12:29:31 am »
0
dirty dirty dirty integration by parts; never learned this method >.<


probably why i could do it ....   :'(
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m@tty

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Re: Interesting questions (spesh)
« Reply #76 on: October 31, 2010, 12:31:53 am »
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What, you don't know integration by parts? =S
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Martoman

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Re: Interesting questions (spesh)
« Reply #77 on: October 31, 2010, 12:35:46 am »
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I've never heard of it. Just from reading what brightsky did, it seems as if its just a reverse product rule yeah?
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2011: Holidaying, screw school.
No. Not azn.
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m@tty

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Re: Interesting questions (spesh)
« Reply #78 on: October 31, 2010, 12:36:24 am »
0
Yep.




EDIT:
Derivation from product rule:





« Last Edit: October 31, 2010, 12:39:24 am by m@tty »
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Martoman

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Re: Interesting questions (spesh)
« Reply #79 on: October 31, 2010, 12:53:52 am »
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ha yay for my intuition ::)
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2011: Holidaying, screw school.
No. Not azn.
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brightsky

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Re: Interesting questions (spesh)
« Reply #80 on: October 31, 2010, 03:41:44 pm »
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Next question (this one's trivial compared to the other one, but daunting if you don't know the right technique):

Find .
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werdna

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Re: Interesting questions (spesh)
« Reply #81 on: October 31, 2010, 10:49:57 pm »
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brightsky... I cannot believe you're in YEAR NINE. WTF.
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Martoman

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Re: Interesting questions (spesh)
« Reply #82 on: November 06, 2010, 04:35:34 pm »
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Quote from: brightsky on October 31, 2010, 03:41:44 pm
Next question (this one's trivial compared to the other one, but daunting if you don't know the right technique):

Find .

By feeling its about 0.8, as a rectangle feels as if it can be plotted to it, width 0.8ish height 1 because of the trig functions. I'll try this more in depth soon when i find the time, but is the approximation right?
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2011: Holidaying, screw school.
No. Not azn.
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theuncle

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Re: Interesting questions (spesh)
« Reply #83 on: November 06, 2010, 05:32:30 pm »
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don't think it can be a rectangle as it goes through (0,0), as for the answer? no idea!
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Martoman

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Re: Interesting questions (spesh)
« Reply #84 on: November 06, 2010, 05:53:05 pm »
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yeah but what you'll get is multiple rectangles. For these questions I refuse to use a calculator as they should be beautiful. In this regard my sense is that multiple rectangles will be formed.
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2009: Math methods: 50, Psychology: 44
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2011: Holidaying, screw school.
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itolduso

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Re: Interesting questions (spesh)
« Reply #85 on: November 06, 2010, 07:28:54 pm »
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Quote from: Martoman on November 06, 2010, 05:53:05 pm
yeah but what you'll get is multiple rectangles. For these questions I refuse to use a calculator as they should be beautiful. In this regard my sense is that multiple rectangles will be formed.

how did you sense it is about 0.8?
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Martoman

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Re: Interesting questions (spesh)
« Reply #86 on: November 06, 2010, 07:56:42 pm »
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Its just a number that pops in my head; doing maths with feeling is how I usually approximate things, i don't know *why* thats for when I put pen to paper.
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2009: Math methods: 50, Psychology: 44
2010: chem 47, further 48, Spesh 49 fml seriously and other yr 11 subs.
2011: Holidaying, screw school.
No. Not azn.
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itolduso

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Re: Interesting questions (spesh)
« Reply #87 on: November 06, 2010, 08:01:36 pm »
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there are infinite no. of nos. and you picked 0.8 you must have extraordinary sense
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iNerd

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Re: Interesting questions (spesh)
« Reply #88 on: November 06, 2010, 08:07:38 pm »
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Quote from: Cambridge0012 on October 31, 2010, 10:49:57 pm
brightsky... I cannot believe you're in YEAR NINE. WTF.
Seconded. WTF? :o
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Martoman

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Re: Interesting questions (spesh)
« Reply #89 on: November 06, 2010, 08:11:38 pm »
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Its like saying 999 items at 876.98 each you have the sense that its about 876.98*1000 its not guessing a random number.
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2009: Math methods: 50, Psychology: 44
2010: chem 47, further 48, Spesh 49 fml seriously and other yr 11 subs.
2011: Holidaying, screw school.
No. Not azn.
___________________________________
Swedish meal time all the time
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