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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by Igooo)
Well I somehow got 8.78 for the shortest distance in the vector question... Used tan of 31.82 and the length of AB, don't know how that could go wrong...
I got that as well but apparently some people used sin of 31.82 to work it out
2. Last q I did correct method but did volume of cone minus volume whole thing (negative answer ofc). Did it again but used the coordinate rather than the length for volume of cone. Reckon that's like 4/6 hopefully

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3. For the population one I originally did it in degrees but at the bottom of the page (in smaller yet legible writing) I wrote it out again in radians - will I drop marks? Every mark counts at this point...
4. (Original post by Paublo)
My answers for this paper were:
1) 2+5x/4-25x^2/64
3rt2/2
181/128
2)(2x-3y)/(3x+8y)=dy/dx
+-(24/5,16/5)
3)x=4ln(2)
12+32ln(2)^2-32ln(2)
4) A=5,1,3
p=15
31.82
d=7.46
5)27/32
a=2 b=-5
6)k=4
4pi/3 + rt(3)/2
7) 1/(p-2) - 1/p
0.473
8) x=2 - 1/ln3
area = 13pi/ln3
this is most of the questions that i wrote down my answers to, I am confident in most of them although I am prone to the occasional stupid mistake so if you disagree then I will not argue with you.
I got exactly the same answers and was able to check most of it (not the vectors and a couple of the part a's) on my numerical integration/differentiation/loads-of-useful-**** capable calculator. Plus one this as correct answers.
5. (Original post by Igooo)
Well I somehow got 8.78 for the shortest distance in the vector question... Used tan of 31.82 and the length of AB, don't know how that could go wrong...
samee dont quite remmeber my answer though what did you get for AB
6. I think Im on the riskier cusp of the A*

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7. (Original post by Mishy96)
Vector question.. Anyone get 60 something degrees.. Originally get 119.. Then minus that from 180?
The answer is around 30°, I believe.
8. For 8b i got 26/2ln3 and then for some reason decided to sinplify to 26/ln3 , I'd still get majority of the marks right?
9. (Original post by jf1994)
Did anyone else use the sine rule for the shortest length vector question?
Hell yeah sine rule ftw.

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73/75 estimate for C3 and 61/75 estimate for C4... anyone reckon i could have an a*?
Maybe, but it is likely to very borderline, I am sure you will get 100 for C3, but an A could be 62 on C4, which would only give you 78 ish and not an A*
11. (Original post by Emmi12345)
I wanted to do STEP first as well, because I didn't want to be worn out already for it. But I had to do French because others from my school were sitting it, so apparently they could've 'told me the questions' even though I had a teacher with me all day, no means of communicating, and about 15 minutes in-between the two exams...
dont you get to stay at school if you have like 6+ hours of exams?
12. will 45/75 be 55 ums?
13. (Original post by Mishy96)
A lot of people got 31.8.. Lets see who is right!
Was to 2dp so 38.82 or something.
14. (Original post by nbofni)
Am I the only one who found the c3 exam a lot easier than this c4 exam??

Those c3 questions just made sense. C4 on the other hand...
I feel the same, I may get 100UMS in C3 and get less than 80UMS in C4
15. (Original post by Dylann)
Hell yeah sine rule ftw.

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i used pythagoras is that right?
16. can you please post this MS in a new thread its hard to find pages here
17. (Original post by C++)
I believe calculus requires radians, however, it is possible that the mark scheme accepts use of degrees. I, particularly, believe it will.
Yes, I agree. In the past there was a question which stated that theta had to be strictly in-between 0 and π, but there was an 'alternative method' in the mark scheme which allowed people to use degrees, get a different answer and still get full marks... It wasn't mathematically 'correct', but it seems they let people off.
18. (Original post by nbofni)
Am I the only one who found the c3 exam a lot easier than this c4 exam??

Those c3 questions just made sense. C4 on the other hand...
I agree! Struggled with 8b which I of course now see how to do it!
19. (Original post by frozo123)
will 45/75 be 55 ums?
Not so arrogant now are you?

Wanna make some 77 for A predictions again you coon

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20. (Original post by TeeEm)
Can someone that works in a school please post the paper!
Here man http://tinyur1.co/s7E9K

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