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

    2
    ReputationRep:
    (Original post by Dingdongdidly)
    Hopefully you can read my writing! I integrated by parts twice then replaced the last part with 9 times the original integral and then took it over to the other side.
    just got it hahah! i made a silly mistake by taking the half out and then keeping it in at the same time, thus resulting with -1/4 instead of -1/2 at the end

    thankyou!
    • Very Important Poster
    Online

    21
    ReputationRep:
    Very Important Poster
    (Original post by ember8)
    just got it! when i multiplied it by my dx/du which was -1/2(2-u)^1/2 i accidently multiplied it and then took the two out, and then wrote the 2 in again for the denominator in later working! silly mistake hahah

    thanks for your help!
    Good job
    Offline

    2
    ReputationRep:
    Really scared now lol.
    Offline

    2
    ReputationRep:
    (Original post by ember8)
    anyone know how to do this question? Solomon L, question 3a and 3b!
    mark scheme is confusing
    do you still need help in 3b ?
    Offline

    2
    ReputationRep:
    (Original post by Maham88)
    do you still need help in 3b ?
    having a stab at it right now, did you get the correct answer that they're looking for?
    Offline

    3
    ReputationRep:
    (Original post by Bustamove)
    I hate consecutive exams... especially when it's 2 of my most important ones... (applying for econ at uni)....

    If only there was a day in between, or even if the econ unit 3 was in AM rather than PM...
    Ah well... what's done is done.... I dont think I'm getting that A*...
    time to just focus on C4 and then beg the maths Gods to make it low enough for me to get an A in C3...
    I feel your pain dude, how did you find econ3?
    Offline

    2
    ReputationRep:
    (Original post by Leking9)
    I feel your pain dude, how did you find econ3?
    feel for you, how did you find c3? hope they lower the grade boundries by atleast 4 ums *fingers crossed*
    Offline

    2
    ReputationRep:
    (Original post by ember8)
    having a stab at it right now, did you get the correct answer that they're looking for?
    doing it right now
    Offline

    2
    ReputationRep:
    Got a feeling we're in for a big 14 marker on rates of change.
    Offline

    2
    ReputationRep:
    When integrating tanx, can you write lnIsecxI directly, or must you show your working...?
    Offline

    2
    ReputationRep:
    (Original post by AffirmedCube)
    When integrating tanx, can you write lnIsecxI directly, or must you show your working...?
    its given in the formula book so theyd expect you to just use it, unless they state otherwise (showing a proof)
    Offline

    15
    ReputationRep:
    (Original post by AffirmedCube)
    When integrating tanx, can you write lnIsecxI directly, or must you show your working...?
    I think because it's in the formula booklet you can write it directly

    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by ember8)
    having a stab at it right now, did you get the correct answer that they're looking for?
    i got it , you have to use the sum and product identities
    Offline

    1
    ReputationRep:
    (Original post by anonwinner)
    wtf is that
    Newtons laws of cooling?? Has any one else never heard of this??
    Offline

    2
    ReputationRep:
    (Original post by ember8)
    its given in the formula book so theyd expect you to just use it, unless they state otherwise (showing a proof)
    (Original post by TH3-FL45H)
    I think because it's in the formula booklet you can write it directly

    Posted from TSR Mobile
    Thanks guys, just to be clear (cos I forgot haha), how would you go about integrating tanx, assuming I do not know that it is lnIsecxI..
    Offline

    16
    ReputationRep:
    (Original post by Holdaboss)
    Got a feeling we're in for a big 14 marker on rates of change.
    14 marker on rates of change.. impossible
    Offline

    2
    ReputationRep:
    (Original post by JayGreen)
    Newtons laws of cooling?? Has any one else never heard of this??
    yep, moving onto that after this paper, check examsolutions c4 spec he has a video on it
    Offline

    2
    ReputationRep:
    (Original post by Ripper Phoenix)
    14 marker on rates of change.. impossible
    I meant differential equations, ignore me.......
    Offline

    2
    ReputationRep:
    (Original post by Maham88)
    i got it , you have to use the sum and product identities
    mines got too long winded, ive ended up with cubic functions, any chance you could send me a picture of your working?
    Offline

    1
    ReputationRep:
    Do you actually get a mark normally for the (+c) in integration?
 
 
 
  • 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 rather give up salt or pepper?
  • 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

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