Trail topics (1 Viewer)

[jumb]

Hi everybody!

My 4unit trials tomorrow and was wondering, which topic of the trials did you find the hardest, exluding mechanics?

Also, is the integral of (Loge x) and (e^x) the same as their unintegrated selves?

 

[ngai]

well, in our ruse trial this yr, conics and volumes
is the integral of lnx and e^x the same as their unintegrated selves...
hmm, "unintegrated selves"...thats a term i've never heard of
umm...50-50 chance: no?

 

[jumb]

lol my bad phrasing

i meant: Does the integral of (loge x) = Loge x
and does the intgral of (e^x) = e^x
?

 

[withoutaface]

conics and circles (CSSA).

 

[withoutaface]

lol my bad phrasing

i meant: Does the integral of (loge x) = Loge x
and does the intgral of (e^x) = e^x
?

integral of e^x=e^x, but for lnx nope

 

[ngai]

int of lnx = lnx....
just think about it: differentiate y=lnx...thats yr11 stuff

 

[velox]

btw Ngai, nice going in UNSW maths comp

 

[ngai]

lol thank you
how did u know?
u have list of prizewinners?

 

[jumb]

btw i just noticed i dont know how to spell 'trial'

anyway back to the trails

 

[velox]

lol thank you
how did u know?
u have list of prizewinners?

Saw at school. My school had a lot of mentions ,but i think jr had more. NSb shanked.

 

[ngai]

hmm, do u know who came 2nd?
how did u go?

 

[Archman]

nadasi did

 

[Maianbarian]

int of lnx = lnx....
just think about it: differentiate y=lnx...thats yr11 stuff

ok differentiate y = lnx.....
y'=1/x

Hmmm, not quite yr 11 stuff

hmm by parts I get int lnx = xlnx - x but when I use the integrator (http://integrals.wolfram.com) I only get that it = xlnx....

What did I do wrong there?

edit: woah, I'm definatly doing something wrong because when I put ln(x) in the intergrator it gives (lnx^2)/2

 

[Euler]

hmm by parts I get int lnx = xlnx + x but when I use the integrator (http://integrals.wolfram.com) I only get that it = xlnx....

What did I do wrong there?

edit: woah, I'm definatly doing something wrong because when I put ln(x) in the intergrator it gives (lnx^2)/2

need to put functions into integrator correctly. Press the button "How to enter your input". logarithms base e are Log[x]

 

[Maianbarian]

Thanks Euler I was worried for a minute there