Maths Paper 32

[Anomaly]

How did you guys found tan2a? What was the answer, i want to confirm my method.

 

[gerrard]

-24/7

 

[Jazib]

was a piece of cake, which i had a lot of fun TEARING APART AND EAT

 

[Jazib]

i think tan3a is -44/117 ?? not sure though....but i think it is.
and yeah when t become very large x=tan inverse(1/2)

ur right, i cheked this value on calculator!

 

[falcon]

paper was tough,i worked vvvvvvvvvvvvvvvery hard for it,compromised on other subjects,but still,no use..............expecting 40/75,reallllyyyyyyyyy bad,how was every bod'y else paper.please tell.

 

[XWTBSILT]

Paper was tough
couldnt do the differential equation (dead),only seperated and did the integration wrong.
Very differerent to the past papers.
and why did they have to give a complex number in POLAR FORM :x
lets pray for the thresholds to be low

 

[liquidblue23]

Hi =) My paper sucked too! So not what I expected after slogging my ass for the last six months!

Anyway, I had a doubt in Q6(ii) with the parametric equation. Could you guys prove dy/dx = -y/x^2?

The questions was : xlny = 2x + 1
From what I understand: x.(1/y)(dy/dx) + 1y= 2
And then when solved it, my dy/dx = [y(2-y)]/x

I also tried solving the given dy/dx as a differential equation but that didn't give me the given parametric equation! Please tell me how you guys did this one!

 

[supermagic]

xlny=2x+1
lny=(2x+1)/x=2+(1/x)
(1/y).dy=(-x^-2).dx
dy/dx=-(x^-2)/(1/y)=-(y/x^-2)

 

[Vlad]

Very bad paper ~!~

 

[Kaer123]

Hey everyone on the complex number questio i got the modulus right but for argument I expressed the complex number in r(cos angle+isin angle) and since the angle was theeta stated the argument will be theeta will I get any marks for this method PLZ CONFIRM

 

[liquidblue23]

Hi supermagic! Thanks for the solution! =) Do you think they'd give me marks because I have used the product rule and my answer is also correct. Maybe, they'd cut one mark for not showing their dy/dx? What do you think? I know my second part would be correct because I used the given answer for solving it.

 

[supermagic]

i think examiner will give 1mark for differentiate y part(lny) 1mark for x part, 1mark for put together (dy/dx= something) and final mark simplify the something to show the correct answer....

 

[awais kamran]

Hey everyone....
the percentile still exist, i read someone saying that percentile didn't exist, and my P3 was also a hell disaster, worked very hard for it but after the paper i was like, u know wat i mean. but i found the paper very similar to May/june 2008, and the grade threshold was at 49...so lets keep our fingers crossed for May/june 2010

 

[liquidblue23]

@supermagic so basically 3 on 4, right? Phew!

Have any of you guys solved a harder P3 paper? The paper took me by surprise! =|

 

[vivaldi]

Guys dis was da most fucjng paper i ever encounterd...i hope percentile is low!!>

 

[1992]

it will be very low. lowest of all. if u know that threshold for M/J was 50 and that paper was easier that this one.
this one will be 40-45 i think, far more difficult

 

[Jazib]

Hey everyone on the complex number questio i got the modulus right but for argument I expressed the complex number in r(cos angle+isin angle) and since the angle was theeta stated the argument will be theeta will I get any marks for this method PLZ CONFIRM

like i said in the other thread, if u xplained evrything, then it should b full marks!