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# OCR (MEI) Mathematics C3 20/01/2010 watch

• View Poll Results: How did you find the paper?
Easy
13
19.12%
OK-ish
28
41.18%
Hard
25
36.76%
I'm not sure/ i didnt take the exam/ ?
2
2.94%

1. (Original post by josh_a_y)
dontcha mean ln1?

Don't beat urself up, you cant revise for maths anyway and im sure you have a comfy UMS cushion from C1 and C2

You ll get in to cambridge, calm down.
No, they actually mean ln0, which is undefined.
2. (Original post by sidrah)
I was just resolving the angles.. lol and then just ended up reinforcing the statement lol.. they might feel pity on me and give me some marks lol
Why did you use PYTHAG when they gave you the friggin hint to use arcsin x= theta??

3. (Original post by rick4236)
I'm sure they will! I don't know why but I had some serious issues with the final part of the past question. I just couldn't find g(x)
it was just swapping the y for x and then rearrange.. although under the stress of it all, i was slipping up on 'easy' things..
4. (Original post by ily_em)
I was in the process of doing that but then the exam ended.... hopefully I'll get some marks for drawing a nice triangle
Yh exactly the same thing happened to me. I just sat here and worked it out and I was only like 1 step away! damn! lol
5. Does anyone know weather examiners give you full marks for a right answer even if the workng was dubious?
6. (Original post by josh_a_y)
Why did you use PYTHAG when they gave you the friggin hint to use arcsin x= theta??

cos i immediately thought right angled triangle.. and the phythagoras in the x^2 +y^2 = 1 convinced me even more..?
I did get to prove it using that, it just took a longer time..
7. Damn! I can't believe I forgot to use the identity, that question would have been so simple if I remembered to write that down Messed up the other proof question too
8. I think I was the only one at my college to like that paper, everyone came out looking ready to hurt someone or cry...

I got stuck on the max value of f'(x) questionn, but that was because I misread the question and was trying to work out the max value of f"(x) instead haha... put me off a bit...
9. (Original post by josh_a_y)
dontcha mean ln1?

Don't beat urself up, you cant revise for maths anyway and im sure you have a comfy UMS cushion from C1 and C2

You ll get in to cambridge, calm down.
well.. i messed up on the ln question but oh well..
and yeah i guess..
thank you for the much needed 'pep talk'
haha!
its just awful straight after the exam..
10. (Original post by sidrah)
cos i immediately thought right angled triangle.. and the phythagoras in the x^2 +y^2 = 1 convinced me even more..?
I did get to prove it using that, it just took a longer time..
but do you not remember the

cos^2 x + sin^2 x= 1 identity?

heh ur welcome
11. Well I didnt think it was that bad before, but having read everyone's comments i'm not so sure anymore.

Some of the questions were quite unlike any I did in my C3 revision!
12. (Original post by josh_a_y)
but do you not remember the

cos^2 x + sin^2 x= 1 identity?

heh ur welcome

I did but it just did not occur to me at all.. funny how even the sinx/cosx= tanx came up..
they obviously expected c2 revision.. lol
And I think I'm done stressing about it now..
Time to revise for biology, chemistry and mechanics..
The fun never ends(!)
13. This paper is likely to be moderated up 1 or 2 percent

Eg. people with 98/99% will get 100 ums. people with 93/94% will get 95 ums.

That is what happened on last summers paper which IMHO was just as hard as this one.
14. (Original post by foolsihboy)
I think I was the only one at my college to like that paper, everyone came out looking ready to hurt someone or cry...

I got stuck on the max value of f'(x) questionn, but that was because I misread the question and was trying to work out the max value of f"(x) instead haha... put me off a bit...
Same. This was the only part of the paper where I lost marks (as far as I'm aware), simply because I put that if x^2=1/3, then x=+-1/9. Which is evidently wrong.

Stupid mistake but meh it happens.
Same. This was the only part of the paper where I lost marks (as far as I'm aware), simply because I put that if x^=1/3, then x=+-1/9. Which is evidently wrong.

Stupid mistake but meh it happens.
O that's gutting... First time through I did (stupidly)
therefore haha
From what I can remember:

1) x = ln5

5) Graphs one I think. for i) I got b=3, a=0, c=2 ii) a=1 b=-1 c=1 or b=1 c=-1

6) gf(x) = g[f(x)] Substitute functions -f(x) and f(-x) into composite function, should get answer as g[f(x)] both times (under the condition that g(x) is even), therefore composite function is even.

7) Trig identity proof I think

9)iii) f''(x)=0 find value of x, sub into f'(x) and that should give you max gradient.

Not 100% sure that's right, correct me if I'm wrong.

On the whole, I thought the paper wasn't too bad.
I got -ln(1/5) which is kinda the same thing... would i still get the marks?
17. (Original post by icegemsf)
Damn I did that too! Oh well! They should have specified really! lol stupid exam board!
AFAIK unless they use degrees or radians in the question it's completely up to you what to use. Conventionally in such a calculus question , you should use radians but if there's any justice in the world then you won't be marked down for it because the question didn't specify or even imply which you should use. But in future, stick to radians unless otherwise specified for such questions
18. (Original post by harish92)
I got -ln(1/5) which is kinda the same thing... would i still get the marks?
I would say so.
19. (Original post by foolsihboy)
O that's gutting... First time through I did (stupidly)
therefore haha
tbh I'm not too bothered, I can live with a few marks lost. It's my exams next week that are kinda make or break.

btw what modules are you doing for FM?
20. (Original post by i.am.lost)
AFAIK unless they use degrees or radians in the question it's completely up to you what to use. Conventionally in such a calculus question , you should use radians but if there's any justice in the world then you won't be marked down for it because the question didn't specify or even imply which you should use. But in future, stick to radians unless otherwise specified for such questions
Oh ok lets hope so, thanks for that I don't know what made me do that really, usually im always in radians but i think i spent so long on the whole xcos3x=0 thing tht i just got bored! haha

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