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

1. (Original post by sophiekutie)
Umm I'm pretty sure it does... Using the rule cos^2(x) = (1+cos2x)/2. ?
My calculator says the answer is 0, but I'm just wondering how did you integrate the [Cos2xCos4x]?
2. (Original post by HypErTwisT)
My calculator says the answer is 0, but I'm just wondering how did you integrate the [Cos2xCos4x]?
You leave cos2x as it is and for cos4x you use the cos double angle formula but replace x with 2x
3. (Original post by JimmyA*)
You leave cos2x as it is and for cos4x you use the cos double angle formula but replace x with 2x
How do you do Jan 2007 5ii please? i got the answer for the co-efficient to be one and did the correct things before ........ :s
4. (Original post by JimmyA*)
You leave cos2x as it is and for cos4x you use the cos double angle formula but replace x with 2x
surely then why you multiply stuff out you end up with your origional problem of integrating [2cos32x]? I might be missing something here....probably am...
5. Anyone got the jan 13 paper?
6. (Original post by master y)
How do you do Jan 2007 5ii please? i got the answer for the co-efficient to be one and did the correct things before ........ :s
I don't know i just attempted it and got stuck
7. (Original post by master y)
How do you do Jan 2007 5ii please? i got the answer for the co-efficient to be one and did the correct things before ........ :s
Oh i just managed it. You replace x with (x+x^3)
1+(x+x^3)+2(x+x^3)^2+14/3(x+x^3)^3
the X^3 terms are 1 and 14/3x^3 and so the answer is 17/3
8. Jan 2013:
9. (Original post by ArchieL)
Jan 2013:
Thank you so much! but do you have the mark scheme by any chance either?
10. heyy guys can someone please just go through vectors for me because the questions are all usually the same it just confuses the hell out of me:'(
11. (Original post by HypErTwisT)
My calculator says the answer is 0, but I'm just wondering how did you integrate the [Cos2xCos4x]?
Ummmm.... I THINK I used substitution u=sin(2x). But im not 100% sure on that... Can't find the bit of scrap paper I did it on :P
12. Anyone have a really hard question they can ask me?
13. (Original post by master y)
Anyone have a really hard question they can ask me?
what is the meaning of life?
14. (Original post by master y)
Anyone have a really hard question they can ask me?
What is the air speed velocity of an unladen swallow?
15. (Original post by jamesaung)
What is the air speed velocity of an unladen swallow?
Wait, do you mean an African or a European swallow?
16. (Original post by master y)
Anyone have a really hard question they can ask me?
Describe what colours look like.
17. (Original post by stirkee)
what is the meaning of life?
42.
(Original post by jamesaung)
What is the air speed velocity of an unladen swallow?
400ms-1

(Original post by ninuzu)
Describe colours.
Roygbiv.

(Original post by Samj95)
heyy guys can someone please just go through vectors for me because the questions are all usually the same it just confuses the hell out of me:'(
give me a vector q and ill try to help u
18. how's everyone feeling?
19. (Original post by tinkerbell_xxx)
I haven't even started revising
hey me neither! #screwed
20. (Original post by igloo1)
how's everyone feeling?
Kinda meh. I only need a C in this really, but a B would be nice xD

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