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# AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme] watch

1. What was the x-coordinate for Q (cos2q,sinq) ??
2. Dropped the differential equation as I took out a factor of 1/5 and forgot to sub it back in :'((((
3. (Original post by Ual12)
What was the x-coordinate for Q (cos2q,sinq) ??
I got -1/8
4. Did anyone get 11,0,0 as one of their co-ords for E
5. ****ING vectors man!!! FML
6. (Original post by mufcryan)
I got the same

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What did you get for coordinates of E, think I screwed up the C one as well :'(
7. (Original post by MoHoosen9167)
Did anyone get 11,0,0 as one of their co-ords for E
I got this!
8. For the vectors, I got: OE= 1/2AC + OB, OE= 3/2AC + OB
9. I think I got that one wrong as I ended up with 2 values for x, I got 15 and 12.66 hmmmmm oh dear
10. (Original post by MoHoosen9167)
For the vectors, I got: OE= 1/2AC + OB, OE= 3/2AC + OB
Yeah that is what I did, so annoyed about the differential equation!
11. (Original post by MoHoosen9167)
Did anyone get 11,0,0 as one of their co-ords for E
Yeah, and 23 something something for the other
12. Did people get 1/3m for the last answer? I set up the equation as 1/k x pi R squared giving you pi R squared over k... pretty sure this is right...can anyone confirm? 1/k as it was inversely proportional to the area btw
13. (Original post by MoHoosen9167)
I got -1/8

oh..i got a 1/2
I found q as pi/6 and just subbed it in cos2q,i'm probably wrong...
14. (Original post by akashpatel)
Did people get 1/3m for the last answer? I set up the equation as 1/k x pi R squared giving you pi R squared over k... pretty sure this is right...can anyone confirm? 1/k as it was inversely proportional to the area btw
I just got 3m, not one over
15. (Original post by Ual12)
oh..i got a 1/2
I found q as pi/6 and just subbed it in cos2q,i'm probably wrong...
16. Some values I can remember:
A=3 B=-1
(11/3)ln5
dy/dx = 11/8
cos2q = -1/8
r=3
E(11, 0, 0) and something else
17. I got something like 2ln(2x-1) or something for h'(x)... it said to prove it's decreasing but I swear that would make it increase? What was the right derivative? And would you get marks for saying as x tends to infinity h(x) tends to 0?
18. (Original post by HennersPD)
Oh ok thanks! For differentiak equatiobs could they ask us to form one which is inversely proportional? :/
This.
19. (Original post by Nickbonista)
Yeah, and 23 something something for the other
Yeah yeah, I did that!
20. (Original post by akashpatel)
Did people get 1/3m for the last answer? I set up the equation as 1/k x pi R squared giving you pi R squared over k... pretty sure this is right...can anyone confirm? 1/k as it was inversely proportional to the area btw

I got all the same as you for this 😊

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