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AQA Core 3 - Jan 15th 2010

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Reply 100

student92

How hard was that exam!!! :P Damn, Q7 and Q8 grrrrrr @ AQA!

Reply 101

Mitch92uK

The mother of all substitution questions lol. I thought from Q1 it wouldn't be a pleasant paper and when I reached 7/8 that was confirmed!!!

Reply 102

El Guerrouj

Ian80

What did everyone get q as for 7b?
It was the one about d^2y/dx^2 :smile:

I got 16

Reply 103

Mitch92uK

d2y/dx2 4 + 4Tan^24X = dy/dx 4Tan^24X

u = 4x v = Tan u y = 4V^2
du/dx = 4 dy/du = (from previous question) 4 + 4Tan^24X dy/dv = 8V

so dy/dx = 4 x 8V x (4+4Tan^24X). = 32Tan4X(4+4Tan^24X)
so taking 4 out as a factor from that bracket : 128Tan4X(1+Tan^4X) = d2y/dx2 = 128y(1+y^2)

apologies for lack of latex.

Reply 104

JulieP

Damn, that's nothing like what I put lol

Reply 105

Amit92

When I saw Q1 I knew it was going to be a hard paper...7B I got stuck on the most... Q8 was ok...got osmething like 1/16[normal eqns + normal eqns + lnu + c]

Reply 106

SerotoninAddict

That question sucked! And it was like 5 marks right?
I hope a get some method marks, even though I ended up as q=8 which is obviously wrong then :frown:

Reply 107

Vikki =]

It was a weird paper... what did everyone get for 7b?
And 8b I got 1/8(something?

Reply 108

BlondieNC

i couldnt do q1 then was ok for a bit then well down hill what did u all do for the cot^2=11-cosec or something like that the 6 marker i couldnt solve it to start with :frown:

Reply 109

student92

'Vikki

']It was a weird paper... what did everyone get for 7b?
And 8b I got 1/8(something?

I got 1/8 something too for 8b

Reply 110

SerotoninAddict

BlondieNC

i couldnt do q1 then was ok for a bit then well down hill what did u all do for the cot^2=11-cosec or something like that the 6 marker i couldnt solve it to start with :frown:

I replaced cot^2 with (cosec -1) I think :smile:

Reply 111

Amit92

'Vikki

']It was a weird paper... what did everyone get for 7b?
And 8b I got 1/8(something?

I got 1/8 or 1/16 ? I could tell it was right because I checked every detail... I got a 1/8 I think on the outside bracket and then multiplyed the bracket...

Reply 112

student92

Do you think they'll put the grade boundaries down?

Reply 113

Vikki =]

student92

Do you think they'll put the grade boundaries down?

Probably... what did you get for 7b as q?

Reply 114

student92

'Vikki

']Probably... what did you get for 7b as q?

did that completely wrong. For 7a) got P=4
Then 7b) I couldnt differentiate it again, totally went wrong. :s-smilie:

Reply 115

Vikki =]

Oh right fair enough, I just wanna know if anyone else got q=32 as I haven't seen anyone with that yet...

Reply 116

student92

'Vikki

']Oh right fair enough, I just wanna know if anyone else got q=32 as I haven't seen anyone with that yet...

I feel so depressed, gonna do rubbish

Reply 117

jpeace

it was 32y(1+y^2)

4(1 + tan^2 4x)
4 + 4(tan4x * tan4x)
dy/dx = 4(4tan4x sec^2 4x) *2
= 32tan4x sec^2 4x
= 32tan4x(1 + tan^2 4x)

although i left it as 32tan4x(1 + tan^2 4x)

hope thats enough...

Reply 118

Zezzy

AAAAAaaaaaaaaaaaaaaaaaaaaaah what an annoying question 7. The first part was okay, p = 4 anyone?

Then the second part? How were we supposed to figure it out. Some people extended the chain rule as previously posted but I know someone who did product rule since tan^2 4x = tan4x x tan4x then used the answers from part a.

I hope they remove that question or lower the grade boundaries which is unlikely. So thats 5 marks lost really.........that inly gives me a 2 mark comfort for the other 70 marks to get 90%, not very nice...

Reply 119

Twilliams224

I agree that was a bitch of a paper, i hated 7B. and 8B wasnt nice either. I got Q= 32 on 7b so im glad to see a couple of others who got that :smile:

. and I got something over 16 on 8B.