Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    Offline

    6
    ReputationRep:
    (Original post by physicsmaths)
    Not often. But edexcel love surprising people so I would learn them



    Posted from TSR Mobile
    You must have been watching hitlers reaction to the papers on YouTube.
    Offline

    1
    ReputationRep:
    is there a lot of error carried forward marks for c4?
    Offline

    19
    ReputationRep:
    useful material for the upcoming exams

    http://www.thestudentroom.co.uk/show....php?t=3353445

    http://www.thestudentroom.co.uk/show....php?t=3361867

    http://www.thestudentroom.co.uk/show....php?t=3361905
    Offline

    2
    ReputationRep:
    Anyone know of any techniques to check if your partial fraction is correct?
    Offline

    17
    ReputationRep:
    (Original post by Efemena15)
    Anyone know of any techniques to check if your partial fraction is correct?
    Substitute in a value of x into the original form and your partial fractions form. I normally use 7. If they give the same answer you're almost certainly right.
    • Community Assistant
    Offline

    17
    ReputationRep:
    Community Assistant
    (Original post by Efemena15)
    Anyone know of any techniques to check if your partial fraction is correct?
    Plug numbers in your calculator for x and see if you get the same value.
    Offline

    18
    ReputationRep:
    (Original post by Krollo)
    Substitute in a value of x into the original form and your partial fractions form. I normally use 7. If they give the same answer you're almost certainly right.
    Why 7? Lol


    Posted from TSR Mobile
    Offline

    17
    ReputationRep:
    (Original post by physicsmaths)
    Why 7? Lol


    Posted from TSR Mobile
    Small enough so the numbers involved don't get ungainly; large enough so the chance of getting two equal outputs by accident is negligible.
    Offline

    1
    ReputationRep:
    5. Relative to a fixed origin O, the vector equations of the two lines l1 and l2 are l1: r = 9i + 2j + 4k + t(–8i – 3j + 5k), and l2: r = –16i + aj + 10k + s(i – 4j + 9k), where a is a constant. The two lines intersect at the point A.
    (a) Find the value of a. (6)
    (b) Find the position vector of the point A. (1)
    (c) Prove that the acute angle between l1 and l2 is 60°.
    Point B lies on l1 and point C lies on l2. The triangle ABC is equilateral with sides of length 14Ö2.
    (d) Find one of the possible position vectors for the point B and the corresponding position vector for the point C

    parts a,b,c no problemo. Part D slightly confused although i can do part of it just not sure.
    a) -3
    b) -15i,-7j+19k
    c)show that,

    Please help!
    Offline

    2
    ReputationRep:
    Does anybody have tips for parametric into a Cartesian. What do you guys look out for, I seem to be quite weak at it :/


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by lam12)
    Does anybody have tips for parametric into a Cartesian. What do you guys look out for, I seem to be quite weak at it :/


    Posted from TSR Mobile
    Look out for the trig identities


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    Name:  ImageUploadedByStudent Room1433286268.598854.jpg
Views: 284
Size:  138.6 KBName:  ImageUploadedByStudent Room1433286298.984606.jpg
Views: 272
Size:  146.8 KBName:  ImageUploadedByStudent Room1433286316.203074.jpg
Views: 258
Size:  176.4 KBName:  ImageUploadedByStudent Room1433286333.104038.jpg
Views: 262
Size:  145.1 KB

    Can someone explain why I keep getting the wrong coordinates for d even though my method is the same?!!!


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by Medicjug)
    Name:  ImageUploadedByStudent Room1433286268.598854.jpg
Views: 284
Size:  138.6 KBName:  ImageUploadedByStudent Room1433286298.984606.jpg
Views: 272
Size:  146.8 KBName:  ImageUploadedByStudent Room1433286316.203074.jpg
Views: 258
Size:  176.4 KBName:  ImageUploadedByStudent Room1433286333.104038.jpg
Views: 262
Size:  145.1 KB

    Can someone explain why I keep getting the wrong coordinates for d even though my method is the same?!!!


    Posted from TSR Mobile
    Found it was a silly mistake forgot to change sign 🙈


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    hey guys

    haha i feel like i'm spamming up this page

    quick question: how do you solve cotx=0 I was told by my teacher that you can't solve this but in some of the solomon papers they solve them so very confused right now
    Offline

    19
    ReputationRep:
    (Original post by Medicjug)
    hey guys

    haha i feel like i'm spamming up this page

    quick question: how do you solve cotx=0 I was told by my teacher that you can't solve this but in some of the solomon papers they solve them so very confused right now
    cotx = 0 implies tanx = ∞
    which implies x = +- π/2 +- nπ
    Offline

    18
    ReputationRep:
    (Original post by TeeEm)
    cotx = 0 implies tanx = ∞
    which implies x = +- π/2 +- nπ
    You dont need he plus or minuses there just let n take positive and negative values 😉


    Posted from TSR Mobile
    Offline

    19
    ReputationRep:
    (Original post by physicsmaths)
    You dont need he plus or minuses there just let n take positive and negative values 😉


    Posted from TSR Mobile
    it depends how you define n
    Offline

    14
    ReputationRep:
    (Original post by Medicjug)
    hey guys

    haha i feel like i'm spamming up this page

    quick question: how do you solve cotx=0 I was told by my teacher that you can't solve this but in some of the solomon papers they solve them so very confused right now
    Or write is as cosx over sinx which would mean cosx is zero

    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    If you have 3 lns, which order do you add/divide them? Eg. 2ln|2x+1| - 3ln|x+1| + ln|x+3|

    Edit: Would it be

    \ln | \frac{(2x+1)^2 (x+3)}{(x+1)^3} |
    • Peer Support Volunteers
    • Study Helper
    Offline

    19
    Peer Support Volunteers
    Study Helper
    (Original post by Cosmi)
    If you have 3 lns, which order do you add/divide them? Eg. 2ln|2x+1| - 3ln|x+1| + ln|x+3|

    Edit: Would it be

    \ln | \frac{(2x+1)^2 (x+3)}{(x+1)^3} |
    Yep
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: April 20, 2016
Poll
Are you going to a festival?

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.