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

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1. People are saying they got pi/6 for 9ii but I got 0.6.. something. Anyone else?
2. my thoughts are that it is fair paper I just unfortunately messed up q6 so probably dropped about 5 on that and on q9 the final part I got something different from 32sin(theta) somehow and previous part I dropped a mark or so.

Hopefully core four goes better!
3. Hi was x for the last part of 6 not negative?
4. (Original post by daniellon)
1 y=12x=15

2 4x-4Inx-1/x

3 1/13 and 3/4

4 (i) Show that
(ii) 5/2

5 a=6 b=5

6(i) Sketch
(ii) 0.242
(iii) x= 0.242 and y=-0.133

7(i) any real values of g(x) and f(x) is greater and equal to 3
(ii) f is not a one to one function inverse function of g(x) is x+4a/5
(iii) x= 3a/2 and -5a/2

8(i) Show that
(ii) 4+2root 2
(iii) only pie/6
(iv) 32 sin

Any guess for the grade boundaries for an A*?
What about the equations of the reflected curves? I got 1.33 for some reason for y coordinate?

A* will be 63-64+
5. Ugh I didn't do so well, now I'm praying for the grade boundary to be low and do better in C4 to get an A*
6. (Original post by Ligand)
People are saying they got pi/6 for 9ii but I got 0.6.. something. Anyone else?
Actually yeah I think that's what I got. How many marks was that question?
7. (Original post by Ligand)
People are saying they got pi/6 for 9ii but I got 0.6.. something. Anyone else?
I think they are exactly the same
8. for tan(A-B) how do you get 1/13 and 3/4?
9. I didn't get pi/6 or whatever. Pretty sure it was just 4 + 2root 2
10. (Original post by Ligand)
People are saying they got pi/6 for 9ii but I got 0.6.. something. Anyone else?
Yeah I remember getting 0.6 something too.
If the question asked for an exact value that's so silly of me x(
11. (Original post by Mathematicus65)
Actually yeah I think that's what I got. How many marks was that question?
3, ended up being cos2theta =0.25

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12. (Original post by Ligand)
People are saying they got pi/6 for 9ii but I got 0.6.. something. Anyone else?
Yeah, I got 0.659?
13. I got that pretty sure

(Original post by AlfieH)
What about the equations of the reflected curves? I got 1.33 for some reason for y coordinate?

A* will be 63-64+
14. (Original post by Mrrexxxx)
I didn't get pi/6 or whatever. Pretty sure it was just 4 + 2root 2
That was the previous part
15. What did people get for Tan A and Tan B? I managed to get Tan A as 4 and -3 and Tan B as 27 which I'm guessing is wrong
16. (Original post by Keebsclark)
Can anyone help me with what i can do about this? I sat my C3 exam this morning and was given a seat that was much higher than my table(sounds stupid so far, i know) but as someone who has suffered from light occasional back pain for a few years, this caused s much discomfort that i was in serious pain throughout the entire exam (and that was with painkillers) does anyone know if there is anything i can do about this?
Too late now. If you wanted to you could've asked an invigilator to stop and you could've spoken to them about having a break, new chair, etc.

You didn't say anything though so it's too late now I think.
What did people get for Tan A and Tan B? I managed to get Tan A as 4 and -3 and Tan B as 27 which I'm guessing is wrong
Tan^3B was 27 so TanB was 3.
18. (Original post by AlfieH)
What about the equations of the reflected curves? I got 1.33 for some reason for y coordinate?

A* will be 63-64+
because of the reflection in y axis and x axis

Originally, the x and y coordinates are both positive. After the transformation, they will become negative
What did people get for Tan A and Tan B? I managed to get Tan A as 4 and -3 and Tan B as 27 which I'm guessing is wrong
TanB=3
What did people get for Tan A and Tan B? I managed to get Tan A as 4 and -3 and Tan B as 27 which I'm guessing is wrong
tan^3B was = 27 so tanB=3

then use the trig identity formula

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