General Thoughts: Mathematics Extension 1 (1 Viewer)

[danz90]

i made a stupid stupid transcription error in 6a(ii).. which gave me a wrong answer of 90m. far out, u reckon if the markers just see where i copied it to the next line wrong, will penalise me 1 mark, and give me 2/3.. or would i get 1?

 

[blackmage]

Most of my class did that as well,
as well as majority of my friends.
Haha, you are not alone.

 

[tacogym27101990]

i think the integration of sin²xcosx was abit harsh for the people that dont do 4 unit
but im not complaining =]

 

[danz90]

i think the integration of sin²xcosx was abit harsh for the people that dont do 4 unit
but im not complaining =]

wouldn't substitution of u=sinx be sufficient?

 

[independantz]

wouldn't substitution of u=sinx be sufficient?

Yep.

 

[tacogym27101990]

wouldn't substitution of u=sinx be sufficient?

yeah but in 3 unit exams they give you the substitution
so lots of peoplewouldntve known how

 

[blackmage]

Couldn't you change sin^2 x into 1/2(1 + cos2x}?

 

[danz90]

yeah but in 3 unit exams they give you the substitution
so lots of peoplewouldntve known how

ohkk i see were u coming from lol

well i instantly thought that by using u=sinx, u would eliminate the cosx with du/dx.

wat did u get as answer to this one btw?
i forgot wat i wrote

 

[tacogym27101990]

ohkk i see were u coming from lol

well i instantly thought that by using u=sinx, u would eliminate the cosx with du/dx.

wat did u get as answer to this one btw?
i forgot wat i wrote

something along the lines of (sqrt2)/12

 

[dwarven]

OH NO! I just wrote how long it would take, not the time it would be done!

shit.
same here

>_<"
and it even said
what time [to the nearest min.] will it be cooked

 

[danz90]

shit.
same here

>_<"
and it even said
what time [to the nearest min.] will it be cooked

even worsee...

i screwed up that question because when i did part (ii), i stupidly stupidly put freakin TIME in the place of temperature (stupid exam pressure), so my whole answer was screwed.

id get 0/3 ay?

 

[jess.!]

OH NO! I just wrote how long it would take, not the time it would be done!

That's exactly what i did!
OHHHH NOOOOOOOOOOOOOOOOOO!
do you think we could still get maybe 2/3 marks?

 

[u-borat]

how comez none of you know the leet method of integrating cosxsin^2x?

you integrate it straight to sin^3x /3

one step done.

 

[danz90]

something along the lines of (sqrt2)/12

woot i got the samee

so far like 12/12 for Q1, so happy. at least i picked up good marks there, will make up for my stupid stupid stupidddddd errors in other questions, where I had potential to score much more in.

 

[poWerdrY]

how comez none of you know the leet method of integrating cosxsin^2x?

you integrate it straight to sin^3x /3

one step done.

thats what i did, but sometimes i worry its not enough working

 

[jess.!]

the integration of cosxsin^2x is fom the 2005 hsc somewhere around question 4 i think..

 

[krazedrealitii]

well i didn't think it was that hard
but i guess the cosxsin^2x thing may have been difficult for 3u students who expect to be given the substitution

 

[glockenspiel]

i made a stupid stupid transcription error in 6a(ii).. which gave me a wrong answer of 90m. far out, u reckon if the markers just see where i copied it to the next line wrong, will penalise me 1 mark, and give me 2/3.. or would i get 1?

You're making me nervous, I think I got something like that. What was the real answer?

I found it ok, I answered everything.

 

[danz90]

You're making me nervous, I think I got something like that. What was the real answer?

I found it ok, I answered everything.

answer was 96, u probably got it right.
unlike me, the idiot, who wrote 150 instead of 50

 

[dolbinau]

if I didn't rationalise the denominator for the integration in question 1 will I lose marks?