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!! HL Maths 2015 - predictions, guesses, Q & A, discussion ...

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Comments

  • #422
    RoRo979
    Registered Users, Registered Users 2 Posts: 476 ✭✭RoRo979


    12hello345 wrote: »
    why is it '(c cos A, c sin A)' like whats the 'c' about??

    C is the length of the side going to that point. Because this isnt the unit circle and the radius isnt 1, the radius is now C. So the points are all multiplied by C


  • #423
    Blue giant
    Registered Users, Registered Users 2 Posts: 1,336 ✭✭✭Blue giant


    If you search for them on YouTube there's plenty of videos that take you through the proofs step by step. Can be handy if you're stuck on one ;)


  • #424
    skippy1977
    Registered Users, Registered Users 2 Posts: 284 ✭✭skippy1977


    12hello345 wrote: »
    why is it '(c cos A, c sin A)' like whats the 'c' about??

    Well this is the hard part. It's all theory based. The distance from (0,0) out to (c cos A, c sin A) is c. Why c, well we use a,b and c simply because these are the letters needed to make the cosine formula. So that point is a distance of c out. And the point (b,0) is a distance of b out.

    The main thing (at this stage, a few hours before the exam ;)) is to remember the sketch and sub the points into the distance formula. Actually scrub that...watch the Youtube video!


  • #425
    Kremin
    Registered Users, Registered Users 2 Posts: 945 ✭✭✭Kremin


    Good luck to everyone tomorrow, may the theorems be ever so in your favour.


  • #426
    Dkey
    Registered Users, Registered Users 2 Posts: 8 ✭Dkey


    Uhh still studying hope it will go grand. Failed 1st exam this is my only hope ;x

    Good luck to everyone


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  • #427
    The_Mac
    Registered Users, Registered Users 2 Posts: 426 ✭✭The_Mac


    Dkey wrote: »
    Uhh still studying hope it will go grand. Failed 1st exam this is my only hope ;x

    Good luck to everyone

    In the same boat as myself. Good luck everyone!


  • #428
    nifheorais
    Registered Users, Registered Users 2 Posts: 125 ✭✭nifheorais


    The_Mac wrote: »
    In the same boat as myself. Good luck everyone!

    Alot of people found the Honours p1 really difficult .It was worse because the honours students were aware of the upset in the exam hall caused by the ordinary paper shamble .Nobody seems to acknowledge this. The examiners must factor this in when marking the honours paper.

    How can you give 100% when your pals are sitting beside you inconsolable?


  • #429
    Peregrine
    Moderators, Education Moderators Posts: 26,403 Mod ✭✭✭✭Peregrine


    Post exam discussion thread: http://www.boards.ie/vbulletin/showthread.php?t=2057443336


  • #430
    randylonghorn
    Registered Users, Registered Users 2 Posts: 29,509 ✭✭✭✭randylonghorn


    nifheorais wrote: »
    Alot of people found the Honours p1 really difficult .It was worse because the honours students were aware of the upset in the exam hall caused by the ordinary paper shamble .Nobody seems to acknowledge this. The examiners must factor this in when marking the honours paper.

    How can you give 100% when your pals are sitting beside you inconsolable?
    Um, "the Ordinary paper was hard so we have to mark the Honours people easier" ...?

    I genuinely don't see that one getting traction, sorry!


This discussion has been closed.
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