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  1. C

    Which maths topics can be self-learned?

    That's fine then, my school's 4u classes have to get through most of these topics in a month or so next year
  2. C

    Which maths topics can be self-learned?

    Depends, are you doing 4u?
  3. C

    Which maths topics can be self-learned?

    Sorry but is it just me or does boredofstudies have a new layout I've been having a few problems accessing the site so this might be causing my layout to look different
  4. C

    How do you derive eqn of tangent for this?

    I don't know if i used the right method, i just reversed everything and I got it Can someone clarify why i have to reverse everything for me to get the right answer?
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    Confusing Chord of Contact proof by Cambridge

    Sick of your shit BOS
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    Confusing Chord of Contact proof by Cambridge

    Ah I see thank you! Also, is this formula allowed to be used straight away (without derivation) similar to the sum of roots formula and quotient rule, or do you have to derive it every time similar to what we do with the parametric equation of tangents? Edit: just saw hyper's post as the...
  8. C

    Confusing Chord of Contact proof by Cambridge

    That leap in the proof between the pages (...and since P lies on the tangent at B....But the first identity shows that A..) I don't understand how the first identity (and i dont even know which identity it's talking about) shows that A lies on xx0=2a(y+y0). Please clarify this proof for me
  9. C

    locus q

    What were your coordinates for T hyper? My coordinates for T:[ (ap^4-a)/p(p^2-1), a], can't manage to eliminate the parameter to find its locus though Edit: forgot to simplify x-coord: T [ap(p^2+1),a]
  10. C

    Parametric Normals question

    P and Q are the points t=p and t=q on the parabola x=2at, y=at2 There was a question asking me to find the equation of the normals at to the curve at P and Q Then this: Prove that p3-q3=(p-q)(p2+pq+q2) By proving, I assume that I have to use the normals to work this out, but in case I assumed...
  11. C

    Parametric equation

    Yeah sorry for not including all the info, the question says that PQ is a focal chord UPDATED POST
  13. C

    Parametric equation

    P and Q are the points with parameters p and q on the parabola x=2at, y=at2. There were a few questions leading up to what PS+QS was, S being the focus point; Given that PS+QS%3Da%28p%5E%7B2%7D+q%5E%7B2%7D+2%29 and PQ being a focal chord, show that...
  14. C

    Rates of Change question

    The equation of the path of a bullet fired into the air is y=-20x(x-20), where x and y are displacements in metres horizontally and vertically from the origin. The bullet is moving horizontally at a constant rate of 1/2 ms-1. How high does the bullet go, and how far away does it land? Please...
  15. C

    Moving charges in a Magnetic field

    Is this question related to a diagram somewhere? if so, please show us
  16. C

    2014'ers Chit-Chat Thread

    Congrats on 3u! If you don't mind me asking, whereabouts is your school rank?
  17. C

    STATE RANKING CHEM (3rd) AND BIO (12th) and MODERN NOTES

    Bump:D
  19. C

    2014 UMAT study group on Skype

    D A rumpkin cannot be a dumpkin
  20. C

    UNSW Maths Comp Medallist, E4 in MX1/MX2 offering Private Maths Tutoring

    I PM'd you
  21. C

    Division of an interval question

    Argh! Just realised I've been using the y-coordinate for the x value and vice versa Tytytytyty Pls ignore this thread
  22. C

    Division of an interval question

    Please show me the method to solve this: The point F(0,1) divides PQ in the ratio t:1/t, where P is (2t,t2). Find Q Solution is Q(-2/t,1/t2)
  23. C

    Graphing inequality question

    ^ thanks a lot guys Btw drongoski, how do you type up the questions with the vincilum added and everything
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