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AQA Core 4 - Monday 10th June 2013 (AM) - Official Thread

The only thing I'm concerned about is the vectors question. But that's mainly because I did so much differential stuff studying FP3.

I'd advise everyone, in the last few moments, to go over - basic geometry, like knowing what a rhombus is, because it might come up in vectors
and some of your Core 3 integration if it's a while since you touched it, because that shows up in differential equations

GOOD LUCK!

Reply 141

The H

1

I need to be in a completely different frame of mind to answer the vectors question, so I may do it first. That way it's separate from all the others

Reply 142

Joeyye

Would anybody be able to help me with a Jan 13 exponential models question please? It's 7)b) part 1, I'm not sure if I'm supposed to differentiate the original model or get it from somewhere else, thanks :smile:

http://www.thestudentroom.co.uk/attachment.php?attachmentid=224368&d=1370627149

Reply 143

Sir Lagsalot

6

Original post by SherlockHolmes

They are old papers which were made for AQA.

I have attached the first 3 papers and mark scheme.

Do you know where the rest of them are?

Reply 144

Harraah

Original post by Sir Lagsalot

Do you know where the rest of them are?

http://www.mathsgeeks.co.uk/aqa.html

Reply 145

littleangel9914

15

Original post by Joeyye

Would anybody be able to help me with a Jan 13 exponential models question please? It's 7)b) part 1, I'm not sure if I'm supposed to differentiate the original model or get it from somewhere else, thanks :smile:

http://www.thestudentroom.co.uk/attachment.php?attachmentid=224368&d=1370627149

Yeah you differentiate the first expression N=...
by either the qoutient rule it the chain rule. The tricky bit is getting the answer in the form they want after differentiating it

Reply 146

littleangel9914

15

Is this right because in the markscheme they do it differently and so get a different value for C
http://filestore.aqa.org.uk/subjects/AQA-MPC4-W-MS-JUN12.PDF

It's 8bi).

Reply 147

bugsuper

8

Original post by littleangel9914

Yeah you differentiate the first expression N=...
by either the qoutient rule it the chain rule. The tricky bit is getting the answer in the form they want after differentiating it

IIRC you have to work backwards from the answer that they give you to prove that it's the same. Or, at least, that's definitely the easiest way of doing it: have your differentiated N and their expression for dN meet in the middle.

Reply 148

littleangel9914

15

Original post by bugsuper

IIRC you have to work backwards from the answer that they give you to prove that it's the same. Or, at least, that's definitely the easiest way of doing it: have your differentiated N and their expression for dN meet in the middle.

That's how I did it. Hope it make sense

Reply 149

Bord3r

10

Original post by fizzbizz

January 2013 was the easiest paper to date to be honest

No it wasn't. The incredibly low grade boundaries show that is was far from the easiest.

Reply 150

Ravster

12

Are we expected to use/know the factor formulas in C4? The two books I have cover it but I've not seen any questions on them in the past few years.

Reply 151

bugsuper

8

"factor formulas"?

Do you mean like the factor theorem and remainder theorem? Because that seems to come up every paper.

If you mean the trig ones, which I suspect you do, then I don't think so, because it's not on the specification:

http://filestore.aqa.org.uk/subjects/AQA-6360-W-SP-13.PDF

Check the trig section 12.4 for Core 4. It's just the double-angle formulae and the R-alpha method

Reply 152

Ravster

12

sinA + sinB = 2sin((A+B)/2)cos((A-B)/2)

and so on.

Seems they're not in the spec which is good. It's strange because both my AQA C4 books cover them. Thanks all the same.

Reply 153

Bord3r

10

Original post by Ravster

sinA + sinB = 2sin((A+B)/2)cos((A-B)/2)

and so on.

Seems they're not in the spec which is good. It's strange because both my AQA C4 books cover them. Thanks all the same.

They haven't appeared on any past papers I've done.

Reply 154

MedicineMann

9

On core four jan13 past paper question 5a why do you not need to integrate by parts?

Reply 155

M^2012

Original post by MedicineMann

On core four jan13 past paper question 5a why do you not need to integrate by parts?

Integration by parts doesn't always work, if the powers that the variables are to don't cancel out nicely etc

Reply 156

llmcc

could somebody please help me with a question from jan'10 core 4?
its question 2 part c.

its solving cos x + 3 sinx = 2
in part a you get that cos x + 3sinx = (10)^1/2 cos (x-1.249)

need to find all answers in range 0 - 2 pi
but i can only get 2 answers, mark scheme says 4 but dont know how to get these!! please help!!

Reply 157

MedicineMann

9

Original post by M^2012

Integration by parts doesn't always work, if the powers that the variables are to don't cancel out nicely etc

So why does x(x^2+3)^1/2 integrated become p(x^2+3)^3/2?

Reply 158

MedicineMann

9

Original post by llmcc

could somebody please help me with a question from jan'10 core 4?
its question 2 part c.

its solving cos x + 3 sinx = 2
in part a you get that cos x + 3sinx = (10)^1/2 cos (x-1.249)

need to find all answers in range 0 - 2 pi
but i can only get 2 answers, mark scheme says 4 but dont know how to get these!! please help!!