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# Mr M's OCR (not OCR MEI) Core 2 Answers May 2012 <strong><font

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1. for questio 7 if you got the right answer but didnt use the method which will probably be on the markscheme ( the traingle one) would you still get the marks? i ended up using sin^2 +cos ^2 =1 and then devided by cos^2 and did a whole bunch of other stuff :/
2. What was question 7 about? and did it require your calculator to be in degrees mode?
3. Mr M, on question 7ai) I left it as 5/root29. Would I loose a mark for not writing it in standard form?
4. (Original post by Andy16)
What was question 7 about? and did it require your calculator to be in degrees mode?
its was tana =2/5 find sina or could have been cosa i cant remember exactly
5. For question 7 I put the answer in decimal form, correct to three significant figures. Would that mean that I get no marks?
6. (Original post by Mr M)
periodic/repeating is fine
What about reoccuring sequence of o.5 and 4, thats what I put would I get "reoccuring"

also for 0.5<x<2 would I have got any marks for x>2 because i calculated that it needed 2 correctly but did put it the right way around
7. What was the technique for doing question 7 part A?
8. If for question 1)ii) i got the sign between the two expansions wrong so i got all the wrong terms, will i lose both marks or only one??
9. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

1. (i) (4 marks)

(ii) (2 marks)

2. (i) (3 marks)

(ii) (3 marks)

3. (i) (1 mark)

(ii) r = 15 (2 marks)

(iii) 34.4 (3 marks)

4. x = 48.6, 131, 90 degs (6 marks)

5. (a) (i) and (2 marks)

(ii) Cycles periodically between 4 and 1/2 (1 mark)

(b) a = -2 and d = 2.5 (5 marks)

6. (i) Show trapezium rule (3 mark)

(ii) Sketch graph showing trapeziums under the curve (2 marks)

(iii) (4 marks)

7. (a) (i) (2 marks)

(ii) (3 marks)

(b) (3 marks)

8. (i) Show a = -4 and obtain b = 3 (6 marks)

(ii)

g(x) also has (x+3) as a common factor (5 marks)

9. (a) (i) Show fourth term (3 marks)

(ii) (2 marks)

(b) (i) (2 marks)

(ii) (5 marks)
Hi Mr M,

For the question that asked us to find the values of y for which the GP was valid, I put the modulus of y is less than something...I can't remember exactly what the number was but is there a correct version of the answer involving a modulus sign?

Thanks!
10. (Original post by joemkcarr)
What was the technique for doing question 7 part A?
i think you had to realise that bcause tana =sina/cos a then if you drew out a trinagle the bottom length would be 5 the other would be 2 and so the hypotenuse would be squareroot 29 ( pythagoras) so then sin would be the bottom legth 5 over the hypotenuse so the answer is 5/square root 29
then u can rationalise the denominator but i dont think you had to :/

im really annoyed i didnt spot that in the exam :/
11. How did you do questions 7 and 9.
I have *compleltely* different versions.. and i've super messed this up :/
12. [QUOTE=Mr M;37613431]Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

7. (a) (i) (2 marks)

(ii) (3 marks)

Hi Mr M

Thank again for the mark scheme!
I got
7ai) 5 divided by root 29
ii) 2 root 10 divided by 7 (no minus)

So so you know if these will be marked correct?

Thanks again
13. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

6.(iii) (4 marks)

Mr M
did qu 6iii) have to be an exact value? I wrote BUT then wrote the decimal version next to it and underlined it do you think I'd get the mark??
14. (Original post by 777edr777)
Mr M did qu 6iii) have to be an exact value? I wrote 208/3 BUT then wrote the decimal version next to it and underlined it do you think I'd get the mark??
Same. I got the decimal version. Doubt it matters x
(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

7. (a) (i) (2 marks)

(ii) (3 marks)

Hi Mr M

Thank again for the mark scheme!
I got
7ai) 5 divided by root 29
ii) 2 root 10 divided by 7 (no minus)

So so you know if these will be marked correct?

Thanks again
after the exam someone told me you need to make it minus because it wanted to obtuse angle.

I got what you got but then went and did 1-my answer to try and get the obtuse angle :/
17. For the ratio one, will 0<y<2 get 1 mark?

also what do you think the marks for 100ums would be?
18. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

1. (i) (4 marks)

(ii) (2 marks)

2. (i) (3 marks)

(ii) (3 marks)

3. (i) (1 mark)

(ii) r = 15 (2 marks)

(iii) 34.4 (3 marks)

4. x = 48.6, 131, 90 degs (6 marks)

5. (a) (i) and (2 marks)

(ii) Cycles periodically between 4 and 1/2 (1 mark)

(b) a = -2 and d = 2.5 (5 marks)

6. (i) Show trapezium rule (3 mark)

(ii) Sketch graph showing trapeziums under the curve (2 marks)

(iii) (4 marks)

7. (a) (i) (2 marks)

(ii) (3 marks)

(b) (3 marks)

8. (i) Show a = -4 and obtain b = 3 (6 marks)

(ii)

g(x) also has (x+3) as a common factor (5 marks)

9. (a) (i) Show fourth term (3 marks)

(ii) (2 marks)

(b) (i) (2 marks)

(ii) (5 marks)
MR M PLEASE HELP. for question three i STUPIDLY did not read the pie after 45, but all the rest of my working was correct. So how many marks will i lose for question three? Also for question 7 I left my answers unsimplified but they were correct, so do i loose marks? THANKS
19. Thought i done well but lookin at the answers got a c/b lol
20. (Original post by max25)
MR M PLEASE HELP. for question three i STUPIDLY did not read the pie after 45, but all the rest of my working was correct. So how many marks will i lose for question three? Also for question 7 I left my answers unsimplified but they were correct, so do i loose marks? THANKS
damn i did the exact same.
For q3 i didn't read the pi part which means i got 3ii wrong too.
q7 also, I did all of my answers in decimal form instead of surd form.
I think mr m has stopped responding, so i guess we'll all have to wait till august

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