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AH Maths 2006 Exam Post Mortem


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Poll: How many marks (out of 100) do you think you got? (37 member(s) have cast votes)

How many marks (out of 100) do you think you got?

  1. Less than 30 (6 votes [16.22%])

    Percentage of vote: 16.22%

  2. 30-50 (4 votes [10.81%])

    Percentage of vote: 10.81%

  3. 50-60 (5 votes [13.51%])

    Percentage of vote: 13.51%

  4. 60-70 (11 votes [29.73%])

    Percentage of vote: 29.73%

  5. 70-80 (5 votes [13.51%])

    Percentage of vote: 13.51%

  6. 80-90 (2 votes [5.41%])

    Percentage of vote: 5.41%

  7. 90-100 (4 votes [10.81%])

    Percentage of vote: 10.81%

Vote Guests cannot vote

#41 Jonny-Sensei

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Posted 19 May 2006 - 05:27 PM

QUOTE(bigyun @ May 19 2006, 06:23 PM) View Post

INDUCTION!!!! ALL THAT INTEGRATION!!!! EVEN FUNCTIONS! WTF!


Looking at the paper, 20 marks are for integration based questions. IMO, that's INSANE.
Roll on ze gap year !!

#42 FcukWIT

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Posted 19 May 2006 - 05:28 PM

I cant believe SQA have such huge variations, in the difficulty level. My teacher told me the paper was ridiculous, guess tha makes me feel better.

Someone needs to explain to sqa what exams are. They are suppose to test your knowledge at a MODERATE level.

Not suppose to trick you in every other question and leave you gobsmacked in general

#43 Jason Bourne

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Posted 19 May 2006 - 05:31 PM

QUOTE(Pringles @ May 19 2006, 06:16 PM) View Post

the last question of what I got of it relies this rule.

 cos{^2}x = \frac{1}{2}x + \frac{1}{2}cos2x


where does that rule come from?

YEAH this paper sucked big time! Everyone here seems to think the same thing.

Lets go bomb SQA head quarters yeah.
Nothing!!!!!!!!

#44 south lanarkshire jag

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Posted 19 May 2006 - 05:32 PM

if q13 was the induction one then i think i got that right

i binned my paper on the techers desk so if someone can type it up ill give you the correct answer

#45 bigyun

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Posted 19 May 2006 - 05:32 PM

whos the 90-100 marks guy

what a geek

#46 Jason Bourne

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Posted 19 May 2006 - 05:33 PM

there had to be one! Who ever thinks they got that is well sad.
Nothing!!!!!!!!

#47 bigyun

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Posted 19 May 2006 - 05:36 PM

i jus feel as though ive wasted a year at school!!!!! what were the grade boundaries for last year?

plus how did u do that question i + 1/1+i.


damm that last question was off putting

#48 south lanarkshire jag

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Posted 19 May 2006 - 05:36 PM

QUOTE(Jason Bourne @ May 19 2006, 06:33 PM) View Post

there had to be one! Who ever thinks they got that is well sad.



you never know mate

someone might have got lucky with the qs they revised

#49 Jason Bourne

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Posted 19 May 2006 - 05:37 PM

QUOTE(south lanarkshire jag @ May 19 2006, 06:36 PM) View Post

QUOTE(Jason Bourne @ May 19 2006, 06:33 PM) View Post

there had to be one! Who ever thinks they got that is well sad.



you never know mate

someone might have got lucky with the qs they revised


guess so dry.gif

the last question was SAD
Nothing!!!!!!!!

#50 Jonny-Sensei

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Posted 19 May 2006 - 05:39 PM

QUOTE(Jason Bourne @ May 19 2006, 06:31 PM) View Post

QUOTE(Pringles @ May 19 2006, 06:16 PM) View Post

the last question of what I got of it relies this rule.

 cos{^2}x = \frac{1}{2}x + \frac{1}{2}cos2x


where does that rule come from?


From higher:

cos2x = cos{^2}x - sin{^2}x
cos2x = cos{^2}x - (1 - cos{^2}x)
cos2x = 2cos{^2}x - 1

Rearranging gives the form.
Roll on ze gap year !!

#51 Jason Bourne

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Posted 19 May 2006 - 05:41 PM

QUOTE(south lanarkshire jag @ May 19 2006, 06:32 PM) View Post

if q13 was the induction one then i think i got that right

i binned my paper on the techers desk so if someone can type it up ill give you the correct answer



The square matrices A and B are such that AB=BA. Prove by induction that

 A^nB=BA^n for all integers n=>1.
Nothing!!!!!!!!

#52 smilie

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Posted 19 May 2006 - 05:44 PM

well i think i got about 53% at the most and i was 1 mark off an A in the prelim

my teacher, a former setter of the Ah paper said it is the hardest paper he has ever seen, way harder than the 2002 paper where the pass marks were as follows

A - 66%
B - 53%
C - 41%

so i hope they drop again for this year and i should get a good B


#53 Pringles

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Posted 19 May 2006 - 05:45 PM

yeh thats where I got it from. Where was the de moivres theorem or binomial theorem - asymtotes why couldnt it have been heres the equation you figure out the rest instead of heres the values you work out the trest yourself

#54 Jonny-Sensei

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Posted 19 May 2006 - 05:45 PM

QUOTE(bigyun @ May 19 2006, 06:36 PM) View Post

plus how did u do that question i + 1/1+i.


I got my answer by multiplying 1/1-i by 1+i/1+i.

Rearranging /Simplifying etc gave 1/2 - 1/2i

made z = x + iy = 1/2 - 1/2i
Roll on ze gap year !!

#55 Jason Bourne

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Posted 19 May 2006 - 05:47 PM

QUOTE(smilie @ May 19 2006, 06:44 PM) View Post

well i think i got about 53% at the most and i was 1 mark off an A in the prelim

my teacher, a former setter of the Ah paper said it is the hardest paper he has ever seen, way harder than the 2002 paper where the pass marks were as follows

A - 66%
B - 53%
C - 41%

so i hope they drop again for this year and i should get a good B


cool, i didnt realise they pushed them down that much biggrin.gif

QUOTE(PinkFloyd @ May 19 2006, 06:39 PM) View Post

QUOTE(Jason Bourne @ May 19 2006, 06:31 PM) View Post

QUOTE(Pringles @ May 19 2006, 06:16 PM) View Post

the last question of what I got of it relies this rule.

 cos{^2}x = \frac{1}{2}x + \frac{1}{2}cos2x


where does that rule come from?


From higher:

cos2x = cos{^2}x - sin{^2}x
cos2x = cos{^2}x - (1 - cos{^2}x)
cos2x = 2cos{^2}x - 1

Rearranging gives the form.


so there is no half x in it?
Nothing!!!!!!!!

#56 Pringles

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Posted 19 May 2006 - 05:48 PM

that must mean they will drop the pass mark

#57 smilie

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Posted 19 May 2006 - 05:49 PM

The Gaussian Elimination Qu had an infinite number of solutions as
x=1
y=z+2
z=y-2
of something like that


#58 marcinkania7

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Posted 19 May 2006 - 05:49 PM

That was a paper from HELL blink.gif unsure.gif ph34r.gif

But if you look carefully it's not that bad coz it was possible to do it, Q17 simplifies neatly if you are careful with b) then it's fine..

Should Gaussian be x=1 and y=2z+1 ?

Anyway here are my results:

1. ... can't be bothered to write it down

2a) 1/((2+x)(1+x)^(.5))
2b) (-3lnx)/(9x^2)

3. z=.5 - .5i
Arg(z)= -pi/4
|z|= .5(2)^(.5)

4. dy/dx = (1-y)/x
d2y/dx^2 = (2y-2)/x^2

5. 2^1/3

6. 3ln|x^4-x^2+1| +C

7. a) Proof by induction
When you get to a certain stage it was like 3(k^2+k) or sth anyway you have to do another proof that k^2+k is divisible by 2, then it works
b) counterexample - 2

8. y = sinxe^(-x)

9. x = 1
y = 2z +1

10. T = 60C (??)

11. dy/dx = -1/(1+x^2)

12. ... this was the simpliest one

13. Proof by induction.

14. a) Odd
b) = 2xsinx + 2cosx - (x^2)cosx + C
c) - 4 - (2^(.5))((pi^2)/16)-(pi/2)-2)

15. Plane 2x + y - z = 3
Q (0, 2.5, -.5)
Distance: ((14)^(.5))/2

16. a) r= (x+1)/(x-2)
b) Sn = -(1/3)x(x+1)(1-((x+1)(x-2))^n)
c) for x < .5
S to infinity = x(x+1)/(-3)

17. Just be careful, integration by parts a couple of times and it works.

Anyone had these results?

cheers



They're gonna lower the grade boundaries anyway.

take care

#59 bigyun

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Posted 19 May 2006 - 05:50 PM

yasssss
those stats cud get me a C
waaayayay

#60 Jonny-Sensei

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Posted 19 May 2006 - 05:52 PM

Stupid question = do you lose marks for not doing graphs on the graph paper provided?
Roll on ze gap year !!





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