You are Here: Home

# C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST Tweet

Maths exam discussion - share revision tips in preparation for GCSE, A Level and other maths exams and discuss how they went afterwards.

Announcements Posted on
1. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by sophie0106)
is there an unofficial mark scheme anywhere here?
right at the start on the first page
2. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by otrivine)
cause in the mark scheme for june 2011 mark scheme says f ( 1) 0 = with no sign or substitution*
errors and for conclusion.
?
It says f(-1) = 0 with no sign or substitution errors and for conclusion.

Meaning the A1 will be awarded if the substitution is correct and if a conclusion is present, the M1 will be awarded for just the substitution. You will receive 1 mark for that question.
3. (Original post by otrivine)
even if you say =0?
yes im sure that you need to say 'therefore f(1) = 0' or something like that.

This was posted from The Student Room's iPhone/iPad App
4. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Joshmeid)
It says f(-1) = 0 with no sign or substitution errors and for conclusion.

Meaning the A1 will be awarded if the substitution is correct and if a conclusion is present, the M1 will be awarded for just the substitution. You will receive 1 mark for that question.
even if i said = 0 ?yes cause i did sub ok then i showed that = 0
for example i did F(-2)=whatever the eq and sub = 0
5. (Original post by Joshmeid)
Did you get all the 5 correct solutions? If your method is clearly written down such as:

Then you should be awarded the marks.
Yes i did get 5 solutions correct. My method was written like this. I just divided it straight away without giving 2x values
Last edited by Putch1; 25-05-2012 at 11:28.
6. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
omg easiest paper every yet i made so many stupid mistakes
for the trig one (some how) i managed to get tan2x=5 and i worked out some answers from that... does anyone think ill get any marks for that? or will it just be a big fat zero marks?
7. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
Do you think it matters for the differentiation question if i put the answer as 54.16 with recurring symbol? Cause thats still exact isn't it?

Also, on the integration question - i got the right answer using a different method where you subract y1 from y2 and then integrate. Its a method in the textbook and gets you the right answer. Do you think i will still get all 7 marks?

Thanks!
8. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
Hey, I genuinely found this paper easy, required that you learnt how to do everything that could come up. On question 8) I think I wrote down the Surface Area as: 2pix^2+4pixh, however I still got the correct answers (2.12). Also, for the trig equations question if I got to the point where you switch tanx to sinx/cosx but did not get any further right would that get 1 mark? thanks if any one can reply
9. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by rainbow1994)
...
4 or 5 out of 7, method and accuracy marks lost, expect 5, 4 if the mark scheme is strict.
10. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Spellstheend)
For the trig question I missed 180 but got the rest, will I get 4/5?

Then in the sums proof I did it all correct but used 'S' instead of 'Sn' how many marks would that lose me?
I missed 180 too I think we lose 1 mark
11. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Gmanscoop)
Hey, I genuinely found this paper easy, required that you learnt how to do everything that could come up. On question 8) I think I wrote down the Surface Area as: 2pix^2+4pixh, however I still got the correct answers (2.12). Also, for the trig equations question if I got to the point where you switch tanx to sinx/cosx but did not get any further right would that get 1 mark? thanks if any one can reply
8. b) It's a show that, you haven't shown it so you will lose 2 marks as you haven't shown the answer and you didn't substitute 'h' from part a.

6. a) You may get one mark as you used a trig identity although you only completed the first step and the method mark may be awarded for the whole working.
12. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Brainstormer)
Do you think it matters for the differentiation question if i put the answer as 54.16 with recurring symbol? Cause thats still exact isn't it?

Also, on the integration question - i got the right answer using a different method where you subract y1 from y2 and then integrate. Its a method in the textbook and gets you the right answer. Do you think i will still get all 7 marks?

Thanks!
Differentiation: No, that will be fine.

Integration: Yes you will.
13. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Putch1)
Yes i did get 5 solutions correct. My method was written like this. I just divided it straight away without giving 2x values
Interesting method, full marks as you've clearly shown how you got all the solutions, as the question asked.
14. (Original post by Joshmeid)
Interesting method, full marks as you've clearly shown how you got all the solutions, as the question asked.
Thank you. =]

This was posted from The Student Room's iPhone/iPad App
15. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Brainstormer)
Do you think it matters for the differentiation question if i put the answer as 54.16 with recurring symbol? Cause thats still exact isn't it?

Also, on the integration question - i got the right answer using a different method where you subract y1 from y2 and then integrate. Its a method in the textbook and gets you the right answer. Do you think i will still get all 7 marks?

Thanks!
About the integration one, yes you will definitely get the marks.

For the differentiation one, i'm not 100% sure, but as long as it is equivalent I can't see why they'd mark you wrong. You may lose accuracy mark?
16. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Hamburglar)
Guys, on question 6 part b, where you have to prove the trig equation:

I understand that Tan x = Sin x / Cos x.

However, in my working I didn't actually showed this step, and instead multiplied both sides by Cos X. I jumped to the second step basically.

Will I lose any marks for this? Very annoying if I do, because otherwise I got full marks.
17. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Polo_0)
omg easiest paper every yet i made so many stupid mistakes
for the trig one (some how) i managed to get tan2x=5 and i worked out some answers from that... does anyone think ill get any marks for that? or will it just be a big fat zero marks?
Unfortunately it will probably be 0 marks seeing as you won't get any correct solutions and the correct form was provided as a 'show that' in part a for which you could easily find solutions from.
18. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by oli_G)
About the integration one, yes you will definitely get the marks.

For the differentiation one, i'm not 100% sure, but as long as it is equivalent I can't see why they'd mark you wrong. You may lose accuracy mark?
for trig if you get the 2 values of cos=1/5 will you get 3 marks cause i think 2 marks is sinx=0 cause is more easier?
19. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Hamburglar)
Guys, on question 6 part b, where you have to prove the trig equation:

I understand that Tan x = Sin x / Cos x.

However, in my working I didn't actually showed this step, and instead multiplied both sides by Cos X. I jumped to the second step basically.

Will I lose any marks for this? Very annoying if I do, because otherwise I got full marks.
You may lose a mark as you haven't clearly shown the trig identity (Tan x = Sin x / Cos x), although you multiplied through by cos x which suggests you do know the identity and have used it. This one depends on the examiners mood really..
20. Re: C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
Damn, I made a lot of mistakes out of tiredness :/

On the logs question I just "separated" the bracketed log out, turned. 2 into 3^2 and solved a pretty nasty but incorrect quadratic..

For the circle question I used the cosine rule to calculate the perimeter of the segment not the sector.

For the long division of the cubic I divided fine, but then ignored the 2x^2 and factorised it as if it was 1

On the trig, although I wrote we needed to include the values for Sin2x = 0 I left them out..

:/ any rough estimates on the marks I'd lose?
Last edited by Metigue; 25-05-2012 at 11:08.
Useful resources

## Articles:

Study Help rules and posting guidelinesStudy Help Member of the Month nominations

## Groups associated with this forum:

View associated groups