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# OCR C4 (not mei) 18th June 2013 revision watch

1. (Original post by ihatepeople37)
You are an absolute hero... Total respect for you
S'all good as long as you don't hate me Good luck!
2. Good luck everyone! I've just completely given up on trying to teach myself differential equations.
So fingers crossed that we get no questions about them, haha.
Just hoping for a couple of nice questions on Partial Fractions and Binomial Expansion, and get a D!
3. I hope the fact that I haven done all the past papers doesn't disadvantage me much

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4. Damn I messed up my revision by doing too much bio! D: I want to get an A but I am messing up everywhere! T_T
5. I can't sleep.... This is bad
6. (Original post by ihatepeople37)
I can't sleep.... This is bad
join me on my attempt at an all nighter T_T I went into c3 with 4 hours revision. Found it pretty fine. I need at least 6 hours for C4. Only done like 3 :/
7. (Original post by Stickyelmo)
join me on my attempt at an all nighter T_T I went into c3 with 4 hours revision. Found it pretty fine. I need at least 6 hours for C4. Only done like 3 :/
That makes me feel a bit better knowing someone else is gonna be up for a while yet .... And if I can sleep I will cos I have done a fair bit of revising over the past week
8. (Original post by ihatepeople37)
That makes me feel a bit better knowing someone else is gonna be up for a while yet .... And if I can sleep I will cos I have done a fair bit of revising over the past week

I got a lil' question which shouldn't be too much but if you just learn what sin^2x is integrated into and cos^2x can I just put that down rather than going through all the steps? I make many many errors doing it via the steps
9. (Original post by Stickyelmo)

I got a lil' question which shouldn't be too much but if you just learn what sin^2x is integrated into and cos^2x can I just put that down rather than going through all the steps? I make many many errors doing it via the steps
Yeah I guess so if you can learn it well enough.... Might lose one method mark but might not as well
10. Two week ago I was getting As in this, after not touching it for 2 weeks I barely get Bs! :< Super sad
11. Do you really just use the chain rule to differentiate trig stuff? Thought its too easy
12. (Original post by Stickyelmo)
Damn I messed up my revision by doing too much bio! D: I want to get an A but I am messing up everywhere! T_T
Im in exact same position as you

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13. Can anyone explain how to do question 6) on the January 2012 paper please? (http://ocr.org.uk/Images/79453-quest...hematics-4.pdf)
14. Still awake .... Oh god I'm gonna **** up tomorrow
15. (Original post by Pineapple.)
Can anyone explain how to do question 6) on the January 2012 paper please? (http://ocr.org.uk/Images/79453-quest...hematics-4.pdf)
Ah, if I remember it right, you have to do the volume of revolution of the sin graph and cos graph separately

The sin graph will be rotated between the limits 0 and 1/4pi
The cos graph will be rotated between the limits 1/4pi and 1/2 pi

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16. (Original post by Namrah)
Ah, if I remember it right, you have to do the volume of revolution of the sin graph and cos graph separately

The sin graph will be rotated between the limits 0 and 1/4pi
The cos graph will be rotated between the limits 1/4pi and 1/2 pi

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And then you add the two I think to get the total area of R

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17. I'm really stuck on u substitution. Thats messing everything up for me.

How do I u subsitute:
1/1+sqrt(X) and get 2+2ln(3/4)

2:23AM and I get my first u subsitution like a fricken bawss! LEARN MORE!

3:58AM what is a unit vector o.0

6:37AM Had a 2 hours power nap then a quick shower. Hopefully I can remember what I "learnt" if anything at all
18. (Original post by Pineapple.)
Can anyone explain how to do question 6) on the January 2012 paper please? (http://ocr.org.uk/Images/79453-quest...hematics-4.pdf)
Does anyone know how to do Question 8 from the jan 2012 paper!!!! PLease
19. (Original post by master y)
Does anyone know how to do Question 8 from the jan 2012 paper!!!! PLease
where is thee stuck on it? http://www.ocr.org.uk/Images/135288-...ics-4-june.pdf Mark scheme is pretty straight forward. I'm not sure about part A because I keep getting a 1/3 :/
20. I dont know if this is the best thread I cant find any others about this exact exam, but here's the paper (sorry for the scribbles)

Could someone get a mark scheme up or find Mr M??? I didnt think the paper was that bad, I need a C from it and Im confident I have that...

But yeah, mark scheme anyone??

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