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# OCR MEI C3 Maths June 2015 watch

1. Everyone got 5*(1/100pi) for the rate of change question right? It went to 0.0159 or something?
2. (Original post by conorw6)
Everyone got 5*(1/100pi) for the rate of change question right? It went to 0.0159 or something?
YES!
3. (Original post by conorw6)
Everyone got 5*(1/100pi) for the rate of change question right? It went to 0.0159 or something?

I simplified to
4. What were the limits for the integral on question 8??? Was it 4 and 1?? Some ppl are telling me we had to use x coordinate of P?
5. (Original post by corleone12)
What were the limits for the integral on question 8??? Was it 4 and 1?? Some ppl are telling me we had to use x coordinate of P?
It is 1 and 4, then you subtract it from the area of rectangle 3.
6. (Original post by RemainSilent)
same her lol i just did something like sin x = cos x then tan came out as pi/4 and it didnt wokr out
Wait my I got tan(x) = 1
So my x was pi/4

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7. (Original post by Primus2x)
It is 1 and 4, then you subtract it from the area of rectangle 3.
What was the final area ?
8. For 9iii) I was correct up until substituting in my limits and where I got e^2x, I just substituted in ln(3) as when it should have been 2ln(3) causing me to get the wrong answer. How many marks do you think I will get out of 5?

3?
9. (Original post by corleone12)
What was the final area ?
I don't remember, sorry. If someone tell me what the function was, I could do it.
10. (Original post by Primus2x)
I don't remember, sorry.
Somehow i got 3 for the integral and 4 for rectangle over all i got area of 1
11. (Original post by corleone12)
YES!
yessss!
(Original post by Primus2x)
I simplified to
I'm pretty sure they accept it in exact form or with suitable rounding!
12. Please vote on this poll for A boundary predictions:
http://www.thestudentroom.co.uk/show....php?t=3399719
13. Wait, I remember now.
(Someone seriously needs to fix latex on TSR)
Copy the code to this site http://www.codecogs.com/latex/eqneditor.php
14. (Original post by Connorbwfc)
For arcsin(x)=arcos(x)

Would you get any marks for just putting the answer as Root(2) / 2 ?????
it was 2 marks so i think you will get 1. this was probably the trickiest question on the paper to get 2 marks in i think- mei always have an a* question in c3/c4 papers so this is probably it.

i used arccos x + arcsin x= pi/2 and the equation to get root2 /2

i think you might have to say because they are the smae values at pi/4 or something or solve it properly using an identity
15. If you can't read the equations that were parsed into that mess:

The answer to the area bounded by f(x) and y=1 should be

And the integral of g(x) with respect to x between 0 and 3 is because if you translate y=1, x=1, x=4 by the same vector that transformed f(x) into g(x), they become y=0, x=0, and x=3 and that is equivalent to integrating g(x) between 0 and 3.
16. (Original post by Primus2x)
If you can't read the equations that were parsed into that mess:

The answer to the area bounded by f(x) and y=1 should be

And the integral of g(x) with respect to x between 0 and 3 is because if you translate y=1, x=1, x=4 by the same vector that transformed f(x) into g(x), they become y=0, x=0, and x=3 and that is equivalent to integrating g(x) between 0 and 3.
you can also say area is the same but under x-axis instead of above it
or you can say modulus area is the same
17. I think I have got between 59 and 64 on this paper. Is it still possible to get an A*?
18. 53 = B grade boundary?
19. (Original post by ETRC)
it was 2 marks so i think you will get 1. this was probably the trickiest question on the paper to get 2 marks in i think- mei always have an a* question in c3/c4 papers so this is probably it.

i used arccos x + arcsin x= pi/2 and the equation to get root2 /2

i think you might have to say because they are the smae values at pi/4 or something or solve it properly using an identity
I did it like this
20. I'm going to try and do a mark scheme here. Bare in mind that I'm in Year 12 too >.>

Firstly, thanks to Barrel who actually posted the paper (page 15). here are the pages in order:
http://www.thestudentroom.co.uk/atta...9&d=1434104177
http://www.thestudentroom.co.uk/atta...1&d=1434104202
http://www.thestudentroom.co.uk/atta...3&d=1434104269
http://www.thestudentroom.co.uk/atta...5&d=1434104300

- I wasn't completely sure of the method for the second part, this is what a friend told me the method was (I think I do it correctly). Because of the nature of these two questions, however, I'm not 100% sure you need a method if you get the answer correct. It's only 1 mark each either way ~

Anything I missed or got wrong just ask. If you think it would be marked differently then say so too.

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