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# Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. (Original post by usycool1)
Use factor formulae - they're given in the booklet.
is there any other way to integrate or is that the only way?
2. (Original post by sj97)
By the way, does stuff on graphs of secant and all that come on C4? (I know it is a C3 topic but just in case) Not too strong on it.
chance one in a million ... Not in the spec so it cannot be tested directly
3. (Original post by TeeEm)
I will upload it... do you want the solution too?
Preferable not at first, but if that is not convenient for you then I'll just refrain from looking at it.
4. question made to order, without solution coming up
Attached Images
5. Question ....pdf (22.2 KB, 96 views)
6. (Original post by studentwiz)
ok first part add them together use the additional formula for cos
x+y=4cos(t+pi/6)+2sint
if you expand the left hand side using the cos addition you'll see at the end -2sint cancels with 2sint and you're left with x+y=2root3cost

part b)
first thing you notice is they squared one side, so you have to square the other
so squaring 2root3cost =12cost^2 and they ask for a formula that has no trig, so using the identity sin^2t+cos^t=1 rearrange to get cos^2t and from using the equation y/2=sint replace it into your equation
Thanks a lot, I appreciate it man
7. Hey sorry I just attempted your question.It was fine but my answer is just negative. would i still get the marks? Im really confused as to why its negative. :/
8. (Original post by TeeEm)
question made to order, without solution coming up
Nice question. Will post my answer in spoilers later in case others are having a go.

Attached is my solution for the Q on volume of revolution about x=4 for fun
Attached Images

9. (Original post by kaya_lioness)
Hey sorry I just attempted your question.It was fine but my answer is just negative. would i still get the marks? Im really confused as to why its negative. :/
maybe a sign slip? below is my workings with a positive answer.

10. I ave a feeling that its gonna be peek
11. (Original post by Gilo98)
Nice question. Will post my answer in spoilers later in case others are having a go.

Attached is my solution for the Q on volume of revolution about x=4 for fun
the "made to order question" is A level standard and I made it a "show" so you do not need my solution...

I designing a follow up at the moment is is just disgusting ...
It will take a while to make the numbers work
12. Everyone, for C4 what tends to be the full UMS cap? I'm getting average 72 - but I've been told 100 UMS is always 74? Can anyone confirm please, thanks
13. (Original post by TeeEm)
the "made to order question" is A level standard and I made it a "show" so you do not need my solution...

I designing a follow up at the moment is is just disgusting ...
It will take a while to make the numbers work
Yes - wasn't as difficult as some of the IGYB beasts. Agreed - love 'show' questions in exams for the same reason, it seems they tend to ask these sorts of questions towards the end of the paper to somewhat soften the blow of the harder ones.

No worries, look forward to it.
14. (Original post by Dante991)
Everyone, for C4 what tends to be the full UMS cap? I'm getting average 72 - but I've been told 100 UMS is always 74? Can anyone confirm please, thanks
according to this fancy grade boundary spreadsheet i have average is 72.9
15. (Original post by Dante991)
Everyone, for C4 what tends to be the full UMS cap? I'm getting average 72 - but I've been told 100 UMS is always 74? Can anyone confirm please, thanks
Depends on the paper and how people found it.
Last years was 73/75 for 100UMS.

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16. (Original post by TeeEm)
chance one in a million ... Not in the spec so it cannot be tested directly
What are your honest thoughts on the C3 grade boundaries this year?
17. (Original post by TeeEm)
chance one in a million ... Not in the spec so it cannot be tested directly
But because it's in C3 I swear they can test knowledge from previous necessary modules

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18. (Original post by TheAnnabelle)
Do you not have any other exams till then?
I have C4 on Tuesday and Physics Unit 5 on Thursday.
I'm juggling them both but just grinding revision early morning to night.
Its only 1 week more of torture before I can start to unwind.
19. (Original post by anonwinner)
What are your honest thoughts on the C3 grade boundaries this year?
look at post 260 in
http://www.thestudentroom.co.uk/show....php?t=3327325
20. still struggling i get cosecx all the way simplfied
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21. (Original post by physicsmaths)
But because it's in C3 I swear they can test knowledge from previous necessary modules

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of course but not directly

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