x Turn on thread page Beta
 You are Here: Home >< Maths

# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by NikolaT)

The vector equation of a line is 3i -4j +5k. Find the total volume of the solid formed when it's rotated 2pi around the k axis.

(Yes, I'm joking, couldn't resist.)
Oh my god I **** myself before i saw the last bit.....wouldn't put it past edexcel tbh
2. Paper T is tricky

Posted from TSR Mobile
3. (Original post by themorninglight)

https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf

The mark scheme has c = 1/4 (which I can't seem to get), and I've just had a look at Arsey's model answers and he has c = -1/4 but his answer at the end matches the mark scheme. Does this mean you can get a different value for c and still get the marks somehow?
Hey, I haven't done this paper, didn't know where to find international papers. Where did you get this from and do you happen to have the mark scheme?
4. (Original post by joe1545)
Hey, I haven't done this paper, didn't know where to find international papers. Where did you get this from and do you happen to have the mark scheme?
http://www.thestudentroom.co.uk/show....php?t=2673433

Also: http://www.physicsandmathstutor.com/...-maths-papers/
5. Can someone link me Jan 2015 C4 question paper & mark scheme please?

I'm trying to get hold of that paper but its locked on Edexcel website.
Thanks
6. (Original post by XxKingSniprxX)
Can someone link me Jan 2015 C4 question paper & mark scheme please?

I'm trying to get hold of that paper but its locked on Edexcel website.
Thanks

Same could anyone link me the Jan 15 ial paper?
7. (Original post by Hectors)
Same could anyone link me the Jan 15 ial paper?
Hey, you can find the January 2015 Edexcel Maths papers and mark schemes in this folder: https://drive.google.com/folderview?...HS1ZSTHM#list:)
8. (Original post by Hectors)
Same could anyone link me the Jan 15 ial paper?

If that doesn't work then theres this https://drive.google.com/folderview?...1JXU3hkV0kteTA

Does anyone know if they're any "theory" type questions that come up in C4.

Like in C3 you have stuff on many to one and one to one functions etc?
9. I know there's the trapezium rule thing being an underestimate or overestimate and why. I think there's one for binomial expansion about Why the expansion is valid or something but I don't know that g

Posted from TSR Mobile
10. could anyone please recap quickly on how the find the values of x that the binomial expansion is valid for? forgot everythang
11. (Original post by imnoteinstein)
could anyone please recap quickly on how the find the values of x that the binomial expansion is valid for? forgot everythang
When you have your binomial expansion in the form (1+ax)^n, it's valid for mod x < 1/a; for example a=2 so 2x, it's valid for mod x < 1/2.
12. Can someone help me out with this? Its June 2005 question 4 - I think I'm doing it right but can't seem to integrate
Attached Images

13. Oh wait don't worry lol, I made the 1/cos into sec and it was easy from there lool

Posted from TSR Mobile
14. (Original post by FKA Stiglitz)
When you have your binomial expansion in the form (1+ax)^n, it's valid for mod x < 1/a; for example a=2 so 2x, it's valid for mod x < 1/2.
Thanks
15. Anybody else hating rates of change?
16. (Original post by tazza ma razza)
Anybody else hating rates of change?
No
17. C4, June 2014 (R), Q8c.)

'Find the value of t at this point' - The mark scheme has skipped some steps so i'm a bit confused right now
18. Nope

Posted from TSR Mobile
19. (Original post by Leking9)
C4, June 2014 (R), Q8c.)

'Find the value of t at this point' - The mark scheme has skipped some steps so i'm a bit confused right now
I'm not sure if it works but i would divide by cost so you get

4tant-4=-1/cost

so 4tant-4=-sect

then replace sect with root 1+tansquaredt
and if you square both sides of the equation you should get an equation in tant which you can solve

i'm not 100 percent but i think it should work
20. Are there any variations they could give on finding the volume of a solid formed when rotated by 2pi? Could they say 3pi? lol
It just seems a little shady to go to the effort of saying rotated about 2pi etc when it's not too relevant, as you just use pi*integral of y^2 :/

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 20, 2016
Today on TSR

### Any tips for freshers...

who are introverts?

### More snow?!

Discussions on TSR

• Latest
Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE