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# OCR C3 (not MEI) Official Thread - Tuesday 21st June 2016

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did you have to give the coordinates to 3dp or was 3sf sufficient
If it's the one I'm thinking of, I think it specified 3 sig fig
2. (Original post by drandy76)
I got 32 sin theta Attachment 554313

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oh, i think i got up to line 4 but i think i missed the power of three, how many marks do you think it is to get the sin^4theta
oh, i think i got up to line 4 but i think i missed the power of three, how many marks do you think it is to get the sin^4theta
Only 2 marks for whole question so maybe one? Hard to judge and I'm not too well versed with the mark scheme

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4. (Original post by drandy76)
I got 32 sin theta Attachment 554313

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That's right. I put in a value in the exam and it worked
5. (Original post by drandy76)
In vectors and possible integration I think? Not nearly as much as in c3

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That's good. People say they find C4 easier than C3, would you say that is justified
6. (Original post by drandy76)
Only 2 marks for whole question so maybe one? Hard to judge and I'm not too well versed with the mark scheme

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Thanks, hope i scrape the mark
7. (Original post by SGHD26716)
That's good. People say they find C4 easier than C3, would you say that is justified
I can see why they'd prefer it, neither are particularly different in difficulty imo, depends on what type of question you prefer + How you adjust to vectors

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8. (Original post by Baileyprice1234)
Yeah, how do you do q6?
I can't remember the exact question but I'll try to explain how I did it. You are told that P is a point on both curves and that x=2 so you know they intersect therefore you equate them then substitute in x=2 to have one equation with a's and b's. You are then told the gradient of the curves are equal at P so differentiate both curves sub in x=2 and equate the differentials to get a second equation with a's and b's. Then solve the equations with a's and b's simultaneously to get a=6 b=5. I hope this helps?
9. I didn't say f(x) was many to one but just said that is wasn't one to one would I still get the mark?
10. For question 6, bit messy though

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11. Grade boundary predictions for 100ums???
12. In (6) when I re-substituted into Y I copied the equation wrong to get 8 instead of 18, giving b=0 and a=4. Can anybody tell me how many marks lost this will be.
13. (Original post by angles123)
In (6) when I re-substituted into Y I copied the equation wrong to get 8 instead of 18, giving b=0 and a=4. Can anybody tell me how many marks lost this will be.
2 marks as long as everything before was correct
14. (Original post by SGHD26716)
Just below average I would say. 56 an A.
I guess you're doing C4. How is that compared to C3? I'm doing it next year so is there trig stuff in there as well?
Yeah i'd agree, lower than usual but not by a lot.
C4 is quite similar to C3; there's a lot of integration and differentiation again, the only difference being they involve sin/cos/tan etc. As long as you know the identities it isn't too difficult.
There's a few bits on vectors as well. I enjoy C4 more than C3 and, besides vectors, I'd say it's easier as well. Good luck!
15. in the tan(A-B) 8 mark question I found tanB wrong but did all other working correctly, does anyone know how many marks will I lose?
16. (Original post by oloym)
in the tan(A-B) 8 mark question I found tanB wrong but did all other working correctly, does anyone know how many marks will I lose?
I would say you get all method marks but lose answer marks for not working out tan b correctly and therefore getting the wrong final answers so lose 3
17. The paper itself
Attached Images

18. (Original post by oloym)
in the tan(A-B) 8 mark question I found tanB wrong but did all other working correctly, does anyone know how many marks will I lose?
Me too! I'm guessing you got tanB=27 like I did? I'm hoping that's only 1 or 2 marks lost..
19. I didn't get the C1 C2 curves question, I showed method but kept getting the wrong answer? How many marks would I lose?
20. (Original post by SGHD26716)
Just below average I would say. 56 an A.
I guess you're doing C4. How is that compared to C3? I'm doing it next year so is there trig stuff in there as well?
I think it will definitely be lower than that. Perhaps 52 or 53. It was much harder than usual.

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Updated: August 21, 2016
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