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

1. You know them long 10 mark questions that when you finish you just check your pen and have to stretch your hand
2. (Original post by Kadak)
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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
3. How is everyone feeling for tomorrows exam, how well prepared are you guys?
4. Yep i'm ready for this exam!

... No i'm not
5. Had to recap some implicit differentiation to make the circle gradient questions easier
6. (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
7. Can someone explain logs to me, they really confuse me
8. What is MEI anyway?
9. Good luck to everyone taking C2 tomorrow! Hoping it's something like last year or Solomon J but I don't see it happening
10. (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.
11. http://www.ocr.org.uk/Images/136129-...hematics-2.pdf

Q9)b)i) can anyone help?
12. 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?
13. (Original post by gabby07)
Hi can I just check with someone, if you are using the formula for Sn for a Geometric Progression:

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

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.
14. 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 ?
15. So
-1 < log2y < 1
as r = log2y

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

1/2 < y < 2
16. 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!
17. (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.
18. (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 ?
19. 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
20. good luck today everyone

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