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OCR (not MEI) C2 - Wednesday 20th May 2015 Watch

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    You know them long 10 mark questions that when you finish you just check your pen and have to stretch your hand
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    (Original post by Kadak)
    Posted from TSR Mobile

    I'm confused.For the trapezium rule,I thought it would be this set up,
    It is the same thing. I just put my multiples of 2 at the end for convenience. The formula book puts them on order. It gives the same value
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    How is everyone feeling for tomorrows exam, how well prepared are you guys?
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    Yep i'm ready for this exam!



























    ... No i'm not
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    Had to recap some implicit differentiation to make the circle gradient questions easier
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    (Original post by Killerpenguin15)
    Yep i'm ready for this exam!






















    ... No i'm not
    You should consider doing some revision or C2 past papers if your feeling brave
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    Can someone explain logs to me, they really confuse me
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    What is MEI anyway?
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    Good luck to everyone taking C2 tomorrow! Hoping it's something like last year or Solomon J but I don't see it happening
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    (Original post by onsmirnov)
    Can someone explain logs to me, they really confuse me
    They confuse me a bit too although I think if you know the laws and can apply them then it'll be fine.

    As far as I know, I think these are the main ones: And they only work when the bases in both logs are the same.
    logx + logy = log(xy)
    logx - logy = log(x/y)
    log x(power of n) = nlogx

    Hope this has helped a little bit.
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    http://www.ocr.org.uk/Images/136129-...hematics-2.pdf

    Q9)b)i) can anyone help?
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    I've been doing a load of past papers and I'm still pooing it for tomorrow... I think it's because I got everything on Core 1, did all the past papers at least twice, got nearly 100% in all of them, and still feel like I may have not even scraped a C...

    And everyone is saying it was a nice Core 1 paper? Am I missing something?
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    (Original post by gabby07)
    Hi can I just check with someone, if you are using the formula for Sn for a Geometric Progression:

    \frac{a(1 - r^n)}{1-r}

    with a value of r which is greater than 1, do you switch the equation to:

    \frac{a(r^n - 1)}{r-1}

    Is this correct??!
    Thanks
    To be honest I just use the one in the formula book for any value of r and in all my past papers I've done I haven't had any issue.
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    https://68baf9f6baae001b7abe18b6e880...20C2%20OCR.pdf
    For question 9(i)
    I confused I got min as (-90,0) and max as (90,0).What am I missing ?
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    So
    -1 < log2y < 1
    as r = log2y

    as you know r can only be -1 < r < 1

    1/2 < y < 2
    • Thread Starter
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    I'm going to bed because 3 exams today was a killer (I actually threw up after the last exam lol) but I just wanted to say good luck to everyone tomorrow, hope it goes well!
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    (Original post by Kadak)
    https://68baf9f6baae001b7abe18b6e880...20C2%20OCR.pdf
    For question 9(i)
    I confused I got min as (-90,0) and max as (90,0).What am I missing ?
    Remember it's 2sinx so it's a stretch of scale factor 2

    So it's
    (-90, -2) for the minimum and (90, 2) for the maximum

    You forgot the y axis co-ordinate.
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    (Original post by Peppercrunch)
    Remember it's 2sinx so it's a stretch of scale factor 2

    So it's
    (-90, -2) for the minimum and (90, 2) for the maximum

    You forgot the y axis co-ordinate.
    Ty !Ho would I go though ii a and ii b ?
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    Q9 on june 2012 was the hardest log question ive done, hoping tomorrow is with same consitency as the c1 (like a standard paper) nothing ridiclous
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    good luck today everyone
 
 
 
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