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    Well, C4 is less than a week away now and im not quite up to scratch on everything.

    In particular, im having trouble with vectors / planes, and parametric equations can be quite difficult too.

    Feel free to post questions for other people to answer or if you need help you can post here too
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    how you feling about the comprehension paper? Hopefully it shouldn't be too bad!
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    Im not sure about that one. It should be pretty easy but when we were looking at them in class i found it hard to take in all the information - probably because everyone was chatting and i couldnt concentrate though
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    Oh yeah.....is it true that we will not be tested on small angle approximations from the trig chapter? thats what my teacher told me.
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    I havent heard about that so i would learn it just in case. There isnt all that much to it.

    When θ is small and measured in radians

    Sinθ ≈ θ
    Cosθ ≈ 1 - θ2/2
    Tanθ ≈ θ

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    (Original post by Cortez)
    I havent heard about that so i would learn it just in case. There isnt all that much to it.

    When θ is small

    Sinθ ≈ θ
    Cosθ ≈ 1 - θ2/2
    Tanθ ≈ θ

    Have you been doing the practice papers? nothing in them with regards to this. Yeah, i reckon its best to learn it just in case.
    How did you find C3 if you don't mind me asking? i thought it was harder than the practice papers.
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    Yeah ive been doing the practice papers and havent found a question on them but you never know. I though C3 went pretty well actually but exam results will tell :p:
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    could someone show me how to do q9)ii) of practice paper C4 - C, about vector AM. I dont know where the 9/13 came in the mark scheme? Any help would be much appreciated.
    thanks
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    anyone?
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    Just wondering what the difference is between MEI and normal OCR. All the MEI stuff seems a lot harder, or is this just me?
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    (Original post by fabz)
    Just wondering what the difference is between MEI and normal OCR. All the MEI stuff seems a lot harder, or is this just me?
    No, not really, Mei is just a new version of OCR, and it is alot easier, I mean that! I do Mei Math.

    For more information http://www.mei.org.uk/
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    (Original post by bachelor)
    could someone show me how to do q9)ii) of practice paper C4 - C, about vector AM. I dont know where the 9/13 came in the mark scheme? Any help would be much appreciated.
    thanks
    heh i think thats a mistake because i cant understand it either. Surely you just let λ = 2/3? Which gives a totaly different answer.

    Im scanning it in now - will attach when its done. Hopefully someone can help

    Edit: Here it is
    http://img300.echo.cx/img300/3153/sc...00509333up.jpg
    You might want to save it and rotate it :p:
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    yeah thats what i thought as well, 2/3. Bloody exam board, cant even get together decent mark schemes.
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    I'm on the same question on C4-C...

    If AN was 9/13 of AM, then NM would be 4/13 of AM, but that's not a ratio of 2:1. :confused:

    While I'm here, does anyone know the answer to q. 3 on C4-C?

    Curve y²=x - 1 is rotated round x-axis between 1 and 3

    Surely it's V = ∫πy²dx between 1 and 3
    Which is the same as ∫x-1dx between 1 and 3

    But in the mark scheme they have V = ∫πx^4dx between 0 and 2?

    Sorry i would scan it in but I don't know how!
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    Did they definitely give the curve in this form y²=x - 1?

    Does it say how much they rotated it by because otherwise that's a bit dodgy..
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    (Original post by prittstick)
    I'm on the same question on C4-C...

    If AN was 9/13 of AM, then NM would be 4/13 of AM, but that's not a ratio of 2:1. :confused:

    While I'm here, does anyone know the answer to q. 3 on C4-C?

    Curve y²=x - 1 is rotated round x-axis between 1 and 3

    Surely it's V = ∫πy²dx between 1 and 3
    Which is the same as ∫x-1dx between 1 and 3

    But in the mark scheme they have V = ∫πx^4dx between 0 and 2?

    Sorry i would scan it in but I don't know how!
    The answers to that question is wrong too. I had to ask my teacher about that because it didnt make any sense what so ever and he said it has got to be wrong.
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    (Original post by Spenceman_)
    Did they definitely give the curve in this form y²=x - 1?

    Does it say how much they rotated it by because otherwise that's a bit dodgy..
    Yeah, the question exactly is:

    "The curve y²=x-1 for 1 <* x < 3 is rotated 360° about the x-axis. Find the volume of the solid formed"

    *< in this case is actually "less than or equals to" but I don't know how to make that sign!

    Edited to say -
    Oh that is good cortez! Well good in the sense that it isn't me who doesn't know what I'm doing...damn MEI and their silly mistakes :rolleyes:
 
 
 
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