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Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by Wahid1)
Anyone get the area as root3/2 +2pi/3 or something

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I can't remember. I think I got something like root3/2 + 4pi/3 :/ don't know. Anyone else? Obviously we got something similar.

Hoping my mistakes were a minimal .. need around 97 UMS to counter my terrible c3 exam.
2. (Original post by bobo19966)
It is -5/2t^2
??? Can you explain, I don't see how 5/2t differentiates to -5/2t
3. Arsey taking his time, seens hes struggling with this paper too 8)
4. (Original post by tanvi_)
I did that :/ does the perpendicular bit have to be FROM line 2 or is it from line one of you get what I mean
It is from line 2 yes. So if you're doing the tan method there is no hypotenuse involved.
5. (Original post by joe1545)
I got a squared ln 2 function in my answer, so I think i ****ed that one up
naah you probably didn't, many people got 32(ln2)^2 somethign something
6. (Original post by DomRauba)
Guys, what was the x coordinate , i got 2- 1/ln3
Rings a bell! for the volume of revolution I got 13pi / ln3, any confirmation?
7. I got 31.8 degrees as the acute angle on the vector question and 7.46cm as the shortest distance from B to l1.
8. (Original post by randymarsh)
omg I didn't remember to put p as 4 instead of 4000 so I kept redoing the last part of question 7 as I kept getting a maths error so I ended up not doing question 8 that's my A* gone
I did the same thing ;-;
9. Cant remember what questions go to which but for answers i remember getting
(4.8,3.2) and (-4.8,-3.2)
A = (1.5,0)
Area under curve= 453pi/2 ??
T= 0.473 years
K=4 for the integration by substitution question
32(ln2) -12
Angle= 31.8 i think
Anyone agree or disagree with these?
10. Spoken to a few teachers and predictions are 72 for an A*, 67 for an A, 61 for a B. The paper was substantially easier than previous years.
11. (Original post by Humbers)
No you got your integration and differentiation the wrong way round

LnX differentiates to 1/x not the other way round
****
12. (Original post by Valkyrian)
I can't remember. I think I got something like root3/2 + 4pi/3 :/ don't know. Anyone else? Obviously we got something similar.
Pretty sure I got this too.
13. (Original post by AnonLeak)
Spoken to a few teachers and predictions are 72 for an A*, 67 for an A, 61 for a B. The paper was substantially easier than previous years.
lol you and your teachers are stupid
14. Waiting for the hitler video,

Even though it wasn't that hard.
Bar last part of question 8 and actually reading the question for the last part of question 7 (which I didn't do )
15. (Original post by joe1545)
??? Can you explain, I don't see how 5/2t differentiates to -5/2t
5/2 x t^-1 differentiate to -1x5/2 x t^-2
You did the intergal of 5/2t to 5/2 lnt
How many marks were for the whole vector question?
11 I think, not a bad vector qu!
17. (Original post by MelonKuma)
I got 31.8 degrees as the acute angle on the vector question and 7.46cm as the shortest distance from B to l1.
I got the same
18. (Original post by infinitytheory)
was i the only one who found most of it hard o-o i only fully answered like 3 out of the 8 q's and some parts of the others. I didn't even attempt the vectors one ;-;
When you say only fully answered 3, do you mean that you didn't even attempt all the parts of the other remaining question? o.o

The part I found difficult was coming to a correct answer. There was a lot of messing to be done to get the correct answers. So I expect to missed a lot of answer marks.
19. (Original post by AnonLeak)
Spoken to a few teachers and predictions are 72 for an A*, 67 for an A, 61 for a B. The paper was substantially easier than previous years.
Not easy enough to have 72 for an A* though, Im thinking standard boundaries of 70 for an A* 65 for an A
20. (Original post by AnonLeak)
Spoken to a few teachers and predictions are 72 for an A*, 67 for an A, 61 for a B. The paper was substantially easier than previous years.
No way: people will make silly mistakes too easily.

I just worry I've lost method marks...

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