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# Edexcel C3,C4 June 2013 Thread watch

1. (Original post by Myocardium)
Guys I have a problem with my calculator (a normal everyday casio fx-85gt plus). I managed to press a couple of buttons all at once and I don't know what I've done but it's now come up as having TRUE/FALSE at the bottom of the screen. How do I bring it back to normal (and what would I press to bring up this function again (that I never knew existed)).
SHIFT 9 then 3 then = then AC

clears everything!
2. Hey does any one know what shape areas you need to know for c4. will be eternally grateful!!
3. (Original post by tanno1992)
SHIFT 9 then 3 then = then AC

clears everything!
Thanks - I know what I did now :P
4. (Original post by 06spam)
Hey does any one know what shape areas you need to know for c4. will be eternally grateful!!
if you mean formulae then
rectangle, triangle, trapezium, rhombus, parallelogram, kite, surface area cylinder and any others not in the formulae book.
the specification usually lists assumed knowledge
5. (Original post by Myocardium)
Thanks - I know what I did now :P
I got pretty excited when I found this clear function as well. little things huh
6. has the c3 exam gone?
7. Guys, I kno this isn't a good time to talk about C3, but after I read Arsey's answers. I feel so upset about myself. I don't think I would even get a B for this exam. Is there anyone feeling the same thing too? I am just about to burst into tear!

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8. (Original post by Scorcher)
Use the identity cos(a) - cos(b) = -2sin(A+B/2)sin(A-B/2)

That's A+B all over 2 and A-B all over 2 btw.
(Original post by destinyx)
Do cos(3x-2x) - cos(3x-2x) ie. (cox3xcos2x + sin3xsin2x) - (cos3xcos2x - sin3xsin2x) and work it out from there. There are similar questions to this in one of the exercises in the C4 text book. I just did this paper the other day so happened to have my method close by.
Thanks guys! That'll explain why I couldn't figure it out, we never covered the factor formulae in C3. My C3 teacher wasn't the best
Looks like I'll need to go back to the textbook and practise!
9. (Original post by 06spam)
Hey does any one know what shape areas you need to know for c4. will be eternally grateful!!
square, oblong, trapezium, triangle, parallelogram, circle

I guess that's it.
10. 40/75 marks on the c3 paper would be what ums?
11. (Original post by MasterYi)
I was trying to say wrong thread.

Here's a physics thread which maybe able to help.
http://www.thestudentroom.co.uk/show....php?t=2244676
Haa I'm going crazy.

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12. can someone explain the how the 3rd line gets to the 4th in this mark a scheme? Q5 b)

thanks

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can someone explain the how the 3rd line gets to the 4th in this mark a scheme? Q5 b)

thanks

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14. Will I get marked down for using modulus signs instead of brackets when I'm integrating? (With ln functions)

The mark scheme uses brackets and I used modulus signs, does it make a massive difference?

Thanks

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15. (Original post by May-o2q)
Guys, I kno this isn't a good time to talk about C3, but after I read Arsey's answers. I feel so upset about myself. I don't think I would even get a B for this exam. Is there anyone feeling the same thing too? I am just about to burst into tear!

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I feel that way too I cried after reading his answers :L I need an a to get into uni but after that paper i don't see how I can :'(
16. (Original post by justinawe)

thank you!
17. Hey guys are there any other papers other than solomon and elmwood for maths? If there is then can u please give me the link? Thanks!
18. (Original post by AS01)
Hey guys are there any
other papers other than solomon and elmwood for
maths? If there is then can u please give me the

Try AEA? It has C1-C4 content on it.
19. Lets get it poppin with c4 today!!!

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20. (Original post by This Excellency)
Try AEA? It has C1-C4 content on it.
thank you

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