Edexcel C3,C4 June 2013 Thread

But how would I find out what A and B is? Sorry, still completely stuck :/

Would you mind going through it please? :smile:

Think simultaneous equations. If you put (A+B)/2 = 3x and (A-B)/2 = 2x, then can you go from there? :smile:

Reply 3741

BobLoblawLawBlog

16

Original post by PoorLoser

I've done all the Past papers for c4 (2007 - 2013), and Have no idea what to do now,...

personally, I didn't want to go for solomon papers for C4, but this seems to be my last option...

Oh, does anyone know/have any international C4 papers for me to try?

I saw earlier on this thread an attachment of vector questions from solomon papers or something? are there more of these? can someone link me to the vectors one? or any document which has a compilation of questions os each topic? Thanks!!

I think this will be the first time there is a separate C4 international paper. Have you done the C4 paper from last June that got leaked?

Are you talking about these: http://www.london-oratory.org/maths/

Reply 3742

Theafricanlegend

15

Original post by Exotica

You do know that AC and BC are the radius because it states that Given that the circle with centre C, cuts the line l1 at A and B.

From this and your previous explanation i think i understand now cheers!

Reply 3743

Knoyle quiah

Original post by brittanna

Spoiler

Yes i got everything correct apart from I dont understand where the limits come from, I get limits of 5 and -5 when I make Y=0, to get the 2 X values
please explain

Reply 3744

PoorLoser

2

Original post by brittanna

I think this will be the first time there is a separate C4 international paper. Have you done the C4 paper from last June that got leaked?

Are you talking about these: http://www.london-oratory.org/maths/

that's the link! Thanks :biggrin:

No I haven't tried the 2nd c4 paper only the one most people sat
didn't realise there was a 2nd one :redface:

Where can I find this?

Thanks again!!

Reply 3745

BobLoblawLawBlog

16

Original post by Knoyle quiah

Yes i got everything correct apart from I dont understand where the limits come from, I get limits of 5 and -5 when I make Y=0, to get the 2 X values
please explain

Remember that because you're integrating it parametrically, you want to integrate between the

\theta

values. So find the values of

\theta

when y=0. Integrating between these two values will only give you the top half of the ellipse, so you then need to double it. You could also integrate between

0

and

2\pi

if you wanted to do it all in one go.

Reply 3746

RYRK

2

ok , quick question.

on c4 june 2006 , question 6d says to intergrate (x – 1)ln x dx . i multiplied the whole thing , but that was the wrong thing to do. you are supposed to make (lnx) u and (x-1) dv/dx then do by parts. i got the answer , but my question is, why cant you multiply it out and then integrate, is there some rule that stops you from doing this?

here the question paper https://e8c8970d-a-dbffc5af-s-sites.googlegroups.com/a/virtualfoxdistribution.com/sci18-02-13/dir/e/c4/2006%20Jun%20QP.pdf?attachauth=ANoY7cowMKrn9sDil2moD42g6nPy-aCQSm_o8SUYv8rnSq9mF_G8dijGpWCuJf23OEF53hMTpsr3oLwLBdL3mAXHrS7NR8IBOqEjMvp_O0nYVFmTVMXnlftZ0jzvXy6svaRumoRHyJ7CfTHguIryQuWqYMSqlQaQQdxjenV-F6pVWZSvoCUO5dQ-Fzs7FbO7kQsYgsiTkuvd2hnG6r_CFtkpc9OrAIN9poJbyL1LxDjtbrGL2ZMV8P1HGGS95SrEYAlo-WSVbO6O&attredirects=0

its 6d

Reply 3747

BobLoblawLawBlog

16

Original post by PoorLoser

that's the link! Thanks :biggrin:

No I haven't tried the 2nd c4 paper only the one most people sat
didn't realise there was a 2nd one :redface:

Where can I find this?

Thanks again!!

I'm not sure, sorry :frown:

. I'll try and find it though, and upload it here if I manage to find it.

Reply 3748

Myocardium

Original post by Zaphod77

Think simultaneous equations. If you put (A+B)/2 = 3x and (A-B)/2 = 2x, then can you go from there? :smile:

Ooohhh got it! Thanks!

Btw are we meant to be able to use these formulas to create similar simultaneous equations because we've never been taught this before?

Reply 3749

Zaphod77

1

Original post by RYRK

ok , quick question.

on c4 june 2006 , question 6d says to intergrate (x – 1)ln x dx . i multiplied the whole thing , but that was the wrong thing to do. you are supposed to make (lnx) u and (x-1) dv/dx then do by parts. i got the answer , but my question is, why cant you multiply it out and then integrate, is there some rule that stops you from doing this?

here the question paper https://e8c8970d-a-dbffc5af-s-sites.googlegroups.com/a/virtualfoxdistribution.com/sci18-02-13/dir/e/c4/2006%20Jun%20QP.pdf?attachauth=ANoY7cowMKrn9sDil2moD42g6nPy-aCQSm_o8SUYv8rnSq9mF_G8dijGpWCuJf23OEF53hMTpsr3oLwLBdL3mAXHrS7NR8IBOqEjMvp_O0nYVFmTVMXnlftZ0jzvXy6svaRumoRHyJ7CfTHguIryQuWqYMSqlQaQQdxjenV-F6pVWZSvoCUO5dQ-Fzs7FbO7kQsYgsiTkuvd2hnG6r_CFtkpc9OrAIN9poJbyL1LxDjtbrGL2ZMV8P1HGGS95SrEYAlo-WSVbO6O&attredirects=0

its 6d

You can multiply it out first, but it makes it a lot harder for yourself because you still have to use by parts, and instead of using them once you have to use them twice! It's just easier to use by parts straight away :smile:

Reply 3750

BobLoblawLawBlog

16

Original post by RYRK

ok , quick question.

on c4 june 2006 , question 6d says to intergrate (x – 1)ln x dx . i multiplied the whole thing , but that was the wrong thing to do. you are supposed to make (lnx) u and (x-1) dv/dx then do by parts. i got the answer , but my question is, why cant you multiply it out and then integrate, is there some rule that stops you from doing this?

here the question paper https://e8c8970d-a-dbffc5af-s-sites.googlegroups.com/a/virtualfoxdistribution.com/sci18-02-13/dir/e/c4/2006%20Jun%20QP.pdf?attachauth=ANoY7cowMKrn9sDil2moD42g6nPy-aCQSm_o8SUYv8rnSq9mF_G8dijGpWCuJf23OEF53hMTpsr3oLwLBdL3mAXHrS7NR8IBOqEjMvp_O0nYVFmTVMXnlftZ0jzvXy6svaRumoRHyJ7CfTHguIryQuWqYMSqlQaQQdxjenV-F6pVWZSvoCUO5dQ-Fzs7FbO7kQsYgsiTkuvd2hnG6r_CFtkpc9OrAIN9poJbyL1LxDjtbrGL2ZMV8P1HGGS95SrEYAlo-WSVbO6O&attredirects=0

its 6d

You can multiply it out and integrate it if you want, it will just take a lot longer as you will be integrating what is essentially the first integral as well as lnx. So you are doing twice as much work.

Reply 3751

suncake

14

Original post by Myocardium

Ooohhh got it! Thanks!

Btw are we meant to be able to use these formulas to create similar simultaneous equations because we've never been taught this before?

It's in the 'integration using trigonometry' bit in the textbook. There was a whole chunk of questions using it too :tongue:

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Reply 3752

masryboy94

8

My physics exam is making me not able to do c4 !! :frown:

im gnna fail c4 at this rate arghhh !!

Reply 3753

PoorLoser

2

Original post by brittanna

I'm not sure, sorry :frown:

. I'll try and find it though, and upload it here if I manage to find it.

np, those worksheets should keep me busy for tonight!
I'm just going to practice vectors, integration and connected rates of questions throughout tonight, and tackle 2-3 solomon papers tomorrow

Can't wait to get this exam over and done with, I'm so tired of C4 :frown:

Reply 3754

Zaphod77

1

Original post by Myocardium

Ooohhh got it! Thanks!

Btw are we meant to be able to use these formulas to create similar simultaneous equations because we've never been taught this before?

They don't come up very often, but they are technically part of the C3 syllabus (as is deriving them, which by the way is just the double angle formulae - I think it is in the textbook somewhere!). However, we are given them, so if you do see a question like the one you just did it's worth checking through those formulae. It's unlikely it'll come up, but it could do, it's worth knowing just in case :smile:

Reply 3755

BobLoblawLawBlog

16

Original post by PoorLoser

np, those worksheets should keep me busy for tonight!
I'm just going to practice vectors, integration and connected rates of questions throughout tonight, and tackle 2-3 solomon papers tomorrow

Can't wait to get this exam over and done with, I'm so tired of C4 :frown:

Here you go:

Original post by nm786

here's a copy of the paper: http://www.thestudentroom.co.uk/attachment.php?attachmentid=218600&d=1369299971

Mark Scheme: http://www.thestudentroom.co.uk/attachment.php?attachmentid=218597&d=1369299296

Reply 3756

MedMed12

21

Original post by masryboy94