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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by Heisenberg.)
Got (62+3pi)/(22+pi) and I also agree on the area, that was 12/5.
Sammmeeeeee
2. Good paper, poll pls?
3. what did you guys get for that differential question in days though? I got a big number :/
4. Anyone get (2, -8/5, - 6/5) and (-2, 8/5, 6/5) for E with lambda = +-2/5???
5. (Original post by 1998)
got that
(Original post by Student403)
Prob same but how does that work? It was pm 2/5 for me..

633 mins
(Original post by Heisenberg.)
Got 10 hours, 33 minutes.

And the last term of binomial expansion I got -625/32.
(Original post by HarshaPeed)
You had to round it to the nearest minute
(Original post by ryanroks1)
I got 600 and 30 something so sounds right
(Original post by heyitskim)
633 or something I think
(Original post by Questioner1234)
Yeah 10 hours 33 mins

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What did you get for the actual equation? t=...
6. (Original post by 1998)
got that
Yaay same
7. (Original post by User57)
YAASSS I ACTUALLY GOT THIS Didn't feel like it was worth 5 marks though??
Agreed. More like a 3 marker

Probably a few marks for all the coordinates
8. Grade boundaries going to be high af
9. My full solutions:

1) 1/8 - 15/16 x + 75/16 x^2 - 625/32 x^3

2) 0.6595, 1.083, 8/3 ln(2) - 7/9

3) (-2-4xy)/(2x^2 + 4 + pisin(0.5pi)), (3pi+62)/(pi+22)

4) x=e^(ln(60)-2.5t)), 633 mins

5) (-5root(3)/16), (4,5root3)

6) 3ln(3y+2)-2ln(y)+c, lambda=8, 4pi/3 - root3

7) k=17/2, 1696pi/5

8) {3,5,0}, r = {1,5,2} + lambda{-5,4,3}, k=2, cos(theta)=4/5, area=12/5, possible positions {3, 33/5, 16/5} and {-1, 17/5, 4/5}
10. (Original post by eftio.gea)
Anyone get (2, -8/5, - 6/5) and (-2, 8.5, 6.5) for E with lambda = +-2/5???
Lambda was pm2/5 yes but i didn't get those coords
11. Damn i thought it was okay but then I come on here and see i've made so many silly mistakes... :/
12. 1) (1/8)-(15x/16)+(75x^2/16)-(625x^3/32)

2) 0.6595 for missing value
1.083 for estimate
(8/3)ln2 -(7/9)

3) dy/dx= (-4xy-2)/(2x^2+4+piSinpiY)
X value was (3pi +62)/(pi+22)

4) X= 60e^-2.5t
633 mins nearest minute

5) (-5root3)/16
Q: (4,5root3)

6) not sure about A- partial fractions integration. 3ln(3y+2) -2lnY + c
Show substitution
(4pi/3) -root3

7) k was 8.5, volume was 1696pi /5

8) a was 3,5,0
K equals 2 (AP was 2root2)
Cos= 4/5
E was same as what others have said

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13. For the solid question, working out just the solid between k (think 7/2?) and 1/2, how many marks am I likely to get?
14. (Original post by ryanroks1)
What did everyone get for the normal question where you had to find X? I remember 22 + pi being on the bottom?
i got that on the bottom and 62+ 3pi on the top i think?
15. I got the 62 +3pi/2 + pi but I rushed it so its a bit messy so I'm worried the examiner won't be able to read it.
16. 220pi/7 for that volume question anyone?
17. There was a minute differential question??
18. (Original post by cjlh)
My full solutions:

1) 1/8 - 15/16 x + 75/16 x^2 - 625/32 x^3

2) 0.6595, 1.083, 8/3 ln(2) - 7/9

3) (-2-4xy)/(2x^2 + 4 + pisin(0.5pi)), (3pi+62)/(pi+22)

4) x=e^(ln(60)-2.5t)), 633 mins

5) (-5root(3)/16), (4,5root3)

6) 3ln(3y+2)-2ln(y)+c, lambda=8, 3pi/3 - root3

7) k=17/2, 1696pi/5

8) {3,5,0}, r = {1,5,2) + lambda{-5,4,3), k=2, cos(theta)=4/5, area=12/5, possible positions {3, 33/5, 16/5) and {-1, 17/5, 4/5)
Typo in Q6. 4pi/3

Agree with all
19. (Original post by Seytonic)
What did you get for the actual equation? t=...
x=60e^2.5t
20. Can someone tell me was there a cylinder for the integration question ??
And what were ur answers for the impilicit differentiation. ? I got large intergers as coefficients

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