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

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Reply 1380
What was the x-coordinate for Q (cos2q,sinq) ??
Dropped the differential equation as I took out a factor of 1/5 and forgot to sub it back in :'((((
Original post by Ual12
What was the x-coordinate for Q (cos2q,sinq) ??


I got -1/8
Did anyone get 11,0,0 as one of their co-ords for E
****ING vectors man!!! FML
Original post by mufcryan
I got the same


Posted from TSR Mobile


What did you get for coordinates of E, think I screwed up the C one as well :'(
Original post by MoHoosen9167
Did anyone get 11,0,0 as one of their co-ords for E


I got this! :smile:
For the vectors, I got: OE= 1/2AC + OB, OE= 3/2AC + OB
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
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!
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
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
Reply 1392
Original post by MoHoosen9167
I got -1/8



oh..i got a 1/2 :frown:
I found q as pi/6 and just subbed it in cos2q,i'm probably wrong...
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 :s-smilie:
Original post by Ual12
oh..i got a 1/2 :frown:
I found q as pi/6 and just subbed it in cos2q,i'm probably wrong...


We already had 1/2 when t=Ï€/6
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
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?
Reply 1397
Original post by HennersPD
Oh ok thanks! For differentiak equatiobs could they ask us to form one which is inversely proportional? :/


This.
Original post by Nickbonista
Yeah, and 23 something something for the other


Yeah yeah, I did that!
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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