Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    14
    ReputationRep:
    (Original post by DEWR98)
    Did anyone get -3ycos3y +sin3y=1/6tan(1.5x)+ whatever c was which I can't recall
    yes, c was pi
    Offline

    12
    ReputationRep:
    (Original post by iiPablo)
    Same here, I get extra time and dropped a good 20 marks bc of time management which is pretty gutting as this paper was relatively nice, especially compared to C3, so any chance I had of getting a good grade is fully down the toilet 💔
    Only low grade boundaries can save us now
    • Welcome Squad
    Offline

    6
    ReputationRep:
    Welcome Squad
    (Original post by ThusSpakeAlex)
    I messed up the coefficients in the first question so I got a wrong answer, do you think I'll get a nice ecf only few marks lost?

    Btw did anyone get 1/3 and 5/3 for the values of lambda in the vector question?
    I got those values of lambda

    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by snimkar)
    The questions was to differentiate tan^-1 (3x/2) by implicit differentiation, I didnt do it that way but if you look in the formula book it gives you the general form of differentiating inverse tan which is 1/(1+x^2). Putting in 3x/2 for our x value would give us 1/(1+9/4x^2) so times the whole thing by 4/4 would give you 4/(4 + 9x^2) thats what I did :/
    For that method, you must times the entire thing by the derivative of 3/2, 4x1.5=6 so k is 6 even if you used formula booklet

    (as if use anything that doesn't have the same coefficient of x, you must use chain rule alongside the formula booklet)
    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    Instead of the tan bit in the final equation for the last question I put 1/18xln(4+9^2) but got the constant and rest right? How many marks??
    Offline

    3
    ReputationRep:
    (Original post by MahuduElec)
    For that method, you must times the entire thing by the derivative of 3/2, 4x1.5=6 so k is 6 even if you used formula booklet

    (as if use anything that doesn't have the same coefficient of x, you must use chain rule alongside the formula booklet)
    Posted from TSR Mobile
    I can see them saying MAX 1 mark for differentiation using the standard integral, and that's assuming it's the correct value of k, it specifically said by implicit. Can't see them giving anymore.
    Offline

    1
    ReputationRep:
    I got -4-Pi/2 for C on the last question, wrote it as (Pi+8)/2 on other side of equation
    Offline

    4
    ReputationRep:
    (Original post by C0balt)
    yes, c was pi
    I think I might've put 6 instead of a sixth but I can't remember, I'm hoping I put the latter but it didn't affect my value of c fortunately as X was 0
    Offline

    10
    ReputationRep:
    Is there a mark scheme out yet?
    Offline

    13
    ReputationRep:
    (Original post by C0balt)
    yes, c was pi
    I know you're not an examiner but you do seem really intelligent. If you got the right hand side of the integral wrong but did the left hand side completely right, and did all the integration correctly (as well as every other step), how many marks is it possible to get?
    Offline

    14
    ReputationRep:
    (Original post by DEWR98)
    I think I might've put 6 instead of a sixth but I can't remember, I'm hoping I put the latter but it didn't affect my value of c fortunately as X was 0
    you'd probably only lose one mark anyway, i wouldn't worry.
    Offline

    1
    ReputationRep:
    (Original post by Manliker)
    Ffs i had C as 3
    Same I got C is 3 lol
    Offline

    10
    ReputationRep:
    (Original post by joef1337)
    I managed to store some of my answers in my calculator (Stats mode is great!), besides the "show that" questions, and this is what I had:

    1)A = -1/2, B = 9/2
    -1 + 7x - 22/3 x^2 + O(x^3)
    -1/2 < x < 1/2

    2)x = 0°, 99.6°, 206.4°

    3)A = -3, B = 2, C = 9
    p = -69/2 (lol), q = 9/2

    4) m = 181g, t_1/2 = 330 days

    5) p = 2/15
    r = 1/3, s = 4/15

    6) cos theta = 13/35
    intersection = (2, 0, -1)
    C = (5/2, -5/6, 7/6), D = (3/2, 5/6, 5/6) (or vice versa)

    7) gradient = e^4/2

    8) k = 12, c = -pi (but if you put the +c on the opposite integral, you would have got c = pi assuming that's correct)

    Anyone agree?
    Can someone just confirm that 6c) is correct. Thank you. Also for Q2, zero is not a solution as the limits said between but not including 0 and 360.
    Offline

    1
    ReputationRep:
    What about if I managed to get 8b correct but didn't use the answer to 8a as I didn't manage to do that one? Will I still get all the marks?
    Offline

    10
    ReputationRep:
    (Original post by JoeT7)
    What about if I managed to get 8b correct but didn't use the answer to 8a as I didn't manage to do that one? Will I still get all the marks?
    I think it is highly likely you will get some marks. But the question did say hence...

    So, may be loose a few marks.
    Offline

    14
    ReputationRep:
    (Original post by BioStudentx)
    I know you're not an examiner but you do seem really intelligent. If you got the right hand side of the integral wrong but did the left hand side completely right, and did all the integration correctly (as well as every other step), how many marks is it possible to get?
    Lol thank you :lol:
    Was the question 7 marks?
    Im looking at the 2015 mark scheme and it's a mark each for
    - separating variables
    - integrating LHS or RHS half-correctly
    - LHS correct
    - RHS correct
    - finding C
    - Both sides correct
    - Final answer in the required form
    So I would guess 4 roughly?
    Offline

    16
    ReputationRep:
    lol all this debate about the last question i don't even know what standard integrals are... never even been taught it let alone revised it. yikes.
    Offline

    1
    ReputationRep:
    Does anybody remember how many marks were for each questions roughly in total?
    Offline

    14
    ReputationRep:
    (Original post by Arima)
    lol all this debate about the last question i don't even know what standard integrals are... never even been taught it let alone revised it. yikes.
    because it's part of FP2. The integral of the form 1/a^2+x^2 gives 1/a(tan^-1(x/a)) and the derivation and use of it is taught in FP2. AQA just thought it was funny to include that in C4 paper
    Offline

    4
    ReputationRep:
    (Original post by C0balt)
    yes, c was pi
    I think I might've put 6 instead of a sixth but I can't remember, I'm hoping I put the latter but it didn't affect my value of c fortunately as X was 0

    Do you remember if for the Cosθ question if 0<θ<360 or were there equal signs under because for I think I would've lost a mark for putting the Cosθ=1 values which were 0 and 360
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Would you like to hibernate through the winter months?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.