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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 lilmewho)
What did you guys get for P and Q.
P( pie/6, 0)
Q( pie/2, 0)
anyone agree?
yeah i got the same for P. couldnt work out the co-ord of Q, but luckily p was the important one
2. OMG that was awful

Left quite a few questions. For some reason I couldn't even do the first Q!!
3. (Original post by ily_em)
OMG that was awful

Left quite a few questions. For some reason I couldn't even do the first Q!!
SAMEEE! you would think that its the first question so it would be easyy... but now! they give us the hardest one they possibly can!.
4. In Q1 was x = ln5?
5. horrible paper, was powning the rest.
6. I also got a negative gradient. Did anyone else??
7. That's what I had. Divide both sides by the e's, then ln both sides.
8. (Original post by MarkS2)
In Q1 was x = ln5?
yeah thats what i got, u had to make them equal and thats the correct answer
9. I got a negative gradient in the trig question at -pi/2 at P (x = pi/6)
10. (Original post by MarkS2)
In Q1 was x = ln5?
Yea, you were asked to solve e^2x - 5e^x = 0
11. cant belive i wrote
arccos(pi/6) and arccos (pi/2)
daamn
12. Does it matter that i used 30 instead of pi/6 ? I did the whole question in degrees as I wasn't sure, and there was no indication either way (to my knowledge and I looked)
13. Always seems to happen to me; the past papers that I do are really pretty easy but then the real ones are disgustingly hard. (except c2
14. In integration/differentiation the angle(s) are always supposed to be in radians I believe, so I think it does.
15. yeah, I'm resitting it...I don't even want to know my grade :|
16. (Original post by Schismist)
Does it matter that i used 30 instead of pi/6 ? I did the whole question in degrees as I wasn't sure, and there was no indication either way (to my knowledge and I looked)
yeah i think it has to be radians, but you will still get some marks as it isnt wrong, just incorrect notation
17. right. for q5 the transformation one did you explicity have to specify what a b and c were. cuz i did the question right but i just wrote it in terms of sin x - but i suppose that does show what a b and c are ?
18. 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.
19. Did anyone get (pi/18) - (1/9) for one of the integration answers (can't remember which one) think it was
20. (Original post by MarkS2)
Did anyone get (pi/18) - (1/9) for one of the integration answers (can't remember which one)
YEH

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