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# Edexcel C3,C4 June 2013 Thread watch

1. (Original post by PoorLoser)
AB = OB - OA

so (0,4,1) - (9,-8,2)
Oh my.

can't tell between an i or a j
I am such a moron, hope I don't make mistakes like this tomorrow

Thanks !
2. What shapes do we need to know the area and volumes of?
3. (Original post by Jullith)
Hope this helps:

Attachment 227383
thanks! that made it a whole lot easier!
4. If the C4 paper was leaked, does anyone know where I could find it? Because I'd really like to attempt it as I'm pretty sure the replacement paper this Teusday isn't going to be anything like the past papers I've been doing...especially not after C3!

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5. (Original post by sahjan)
If the C4 paper was leaked, does anyone know where I could find it? Because I'd really like to attempt it as I'm pretty sure the replacement paper this Teusday isn't going to be anything like the past papers I've been doing...especially not after C3!

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i don't think the c4 paper has been leaked
6. (Original post by SuziieB)
...I think you're on your own there, mate...
Qui? this paper i supposed to be (hard i know) but they cant firetruck us up in this paper cuz they made c3 as hard as firtruck :3
7. (Original post by «WD»ddd)
Qui? this paper i supposed to be (hard i know) but they cant firetruck us up in this paper cuz they made c3 as hard as firtruck :3
we can only hope!

Edexcel can do what they want, I wouldn't be surprised if C4 is also hard tbh :/
8. -sintsin3t = cos2t-cos4t? hooow?
9. (Original post by hassassin04)
Those who want challenging vector questions- check AEA.
Those questions would just invoke more panic into the students, I'm just hoping a pleasant vectors question appears so it doesn't reduce my mark as I'm not very strong with my vectors
10. (Original post by Sunil_karan)
i recenly did a solomon intergration question where ln(something) became negative but they took it as positive because they used modulus, i heard in c4 exam conditions they wont do this?
I may be wrong, but I certainly thought they could ask us a question like that! Worth knowing just in case
11. (Original post by Zaphod77)
I may be wrong, but I certainly thought they could ask us a question like that! Worth knowing just in case
can you give an example of a question of this type?
12. (Original post by MathsNerd1)
Those questions would just invoke more panic into the students, I'm just hoping a pleasant vectors question appears so it doesn't reduce my mark as I'm not very strong with my vectors
I'm pretty sure I've missed something but at this point it's a little too late to worry . I'll probs peruse maths 247s videos this afternoon to see if anything's missing in my arsenal technique then I'll do specific hard Qs
13. (Original post by silentriver)
-sintsin3t = cos2t-cos4t? hooow?
Factor formulae from C3
14. (Original post by posthumus)
Factor formulae from C3
yeah i tried that, but im doing something wrong. need the steps!
15. (Original post by silentriver)
yeah i tried that, but im doing something wrong. need the steps!
-2sin(P+Q/2)sin(P-Q/2) = cos(P)-cos(Q)

P+Q/2=t
P+Q=2t

P-Q=6t

2P=8t
P=4t

Q=-2t

1/2[cos(4t) - cos(-2t)]

Is this what you got ?
16. (Original post by keromedic)
I'm pretty sure I've missed something but at this point it's a little too late to worry . I'll probs peruse maths 247s videos this afternoon to see if anything's missing in my arsenal technique then I'll do specific hard Qs
I've just been doing some lovely integration questions last night and hoping to god a nice vectors question comes up, otherwise I'm going to completely fail this!
17. Any predictions for c4

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18. (Original post by posthumus)
-2sin(P+Q/2)sin(P-Q/2) = cos(P)-cos(Q)

P+Q/2=t
P+Q=2t

P-Q=6t

2P=8t
P=4t

Q=-2t

1/2[cos(4t) - cos(-2t)]

Is this what you got ?
Yes. thank you so much! looks like i switched the + and - signs. (As usual) -______-
19. Hey, On the C4 June 2012 paper Q)4) on differential equations, why cant you move the 3 and the y? Is there any rules or tips to avoid these mistakes?
20. http://www.edexcel.com/migrationdocu...s_20120816.pdf

quick question , on question 4)

if I separated the variables and got

integral y/3 dy = integral 1/cos^2 x dx

is this wrong? or will it lead to the same answer

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