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1. Maths c3 18 may 2012
Anyone sit this paper today and wanna help create unofficial marks scheme?
2. Re: Maths c3 18 may 2012
[Hi yeah I did this exam as a repeat. I thought it was quite reasonable. How did you find it?
3. Re: Maths c3 18 may 2012
The C3 exam today was ok, but they worded the questions differently. Does anyone want to compare answers?
4. Re: Maths c3 18 may 2012
Yeah they did! Yeah what answers did you get?
5. Re: Maths c3 18 may 2012
Some of mine could be wrong, but here are mine anyway:

1a. x=2 and x=-5
b. x-3/x-5

2a. Partial fractions: 4/x+2 - 3/x-5
b. 1+3x+9x²
6. Re: Maths c3 18 may 2012
3i. (x+1)(y-6)= -2
ii. touches the x axis at point: x= -2/3

4a. 2-ln3
b. integrating= 5x²/2 + cotx +c
c. d/dx= 2sec²2x(x-3)+3tan2x / (x-3)²
7. Re: Maths c3 18 may 2012
Yeah I got all the same as you for those 4 questions except for 4c I got 2secsquared2x (2x-6) -tan2x over (x-3) squared!
8. Re: Maths c3 18 may 2012
5i. y=af(bx) where a= 3 and b= 2
ii. Transforming graphs: point A is (-2,-4), point B is (0,-4), point C (4,-4) and point D is (6, but the y coordinate is unknown)

6i. Just proving that the root lies between x=0 and x= pi/2
ii. Using Raphson Method twice. First time, x=0.5 and second time, x=0.586 (3sig fig) using x=0 as the first value.

7. This question I found was very intimidating because I had to differentiate such a long equation. My overall answer was 9y-4x-14=0 in the form that they wanted. If you want the answers in more detail, please ask!

8a. It was to prove a trig identity, which was ok.

b. I know my answers are wrong so I will not give it!

9. Re: Maths c3 18 may 2012
(Original post by Alfie1993)
Yeah I got all the same as you for those 4 questions except for 4c I got 2secsquared2x (2x-6) -tan2x over (x-3) squared!
Yes, I am not sure if I got that right... so you might be correct
10. Re: Maths c3 18 may 2012
(Original post by maaa)
5i. y=af(bx) where a= 3 and b= 2
ii. Transforming graphs: point A is (-2,-4), point B is (0,-4), point C (4,-4) and point D is (6, but the y coordinate is unknown)
Yeah I got this!

6i. Just proving that the root lies between x=0 and x= pi/2
ii. Using Raphson Method twice. First time, x=0.5 and second time, x=0.586 (3sig fig) using x=0 as the first value. Same

7. This question I found was very intimidating because I had to differentiate such a long equation. My overall answer was 9y-4x-14=0 in the form that they wanted. If you want the answers in more detail, please ask! Here I got 4x-y-2. That could be wrong though!

8a. It was to prove a trig identity, which was ok.

b. I know my answers are wrong so I will not give it!

For 8b I got 11/24 pi and 19/24 pi. But I think there was supposed to be two other answers here too!!
11. Re: Maths c3 18 may 2012
OMG I got that answer too! But I compared it to one my friends and she got 4 answers, so I assumed I was wrong!
12. Re: Maths c3 18 may 2012
13. Re: Maths c3 18 may 2012
CCEA
14. Re: Maths c3 18 may 2012
Yeah I think we just left out a bit at the end! But I think we should only loose 1-2 marks
Has anyone else done this paper that can compare with these answers?
15. Re: Maths c3 18 may 2012
(Original post by Alfie1993)
For 8b I got 11/24 pi and 19/24 pi. But I think there was supposed to be two other answers here too!!
Yea think i have made some errors as well lol i only need to go from 79 UMS to 82 UMS and I get my A so heres hoping.

As for my answers pretty much the same except:

4c) i dunno how but managed to end up with -cosecxtanx - cotx/x-3

7) i got 7x-4y+1=0 again obviously ive went wrong somewhere

8b) 13/24 pi and 35/24 pi

hioefully I get some method marks tho
16. Re: Maths c3 18 may 2012
(Original post by Alfie1993)
Yeah I think we just left out a bit at the end! But I think we should only loose 1-2 marks
Has anyone else done this paper that can compare with these answers?
I really hope so! Need my A in Maths!
17. Re: Maths c3 18 may 2012
(Original post by mcol2010)
Yea think i have made some errors as well lol i only need to go from 79 UMS to 82 UMS and I get my A so heres hoping.

As for my answers pretty much the same except:

4c) i dunno how but managed to end up with -cosecxtanx - cotx/x-3

7) i got 7x-4y+1=0 again obviously ive went wrong somewhere

8b) 13/24 pi and 35/24 pi

hioefully I get some method marks tho
I am sure you will get working out marks and marks from errors carried forward. I did a past paper a couple of weeks ago and I got a teacher to mark it. Even though my answer was completely incorrect, I still got marks for working out. So the more working out you do, the more likely you will get nearly full marks!
18. Re: Maths c3 18 may 2012
(Original post by maaa)
I am sure you will get working out marks and marks from errors carried forward. I did a past paper a couple of weeks ago and I got a teacher to mark it. Even though my answer was completely incorrect, I still got marks for working out. So the more working out you do, the more likely you will get nearly full marks!
Awe cheers feel better now C4 next Fri paper always baffles me grand with past papers but as soon as in the exam im looking at in going WTF!!
19. Re: Maths c3 18 may 2012
C4 is horrible. Past papers and exam are as bad as each other.Totally not looking forward for this exam at all
20. Re: Maths c3 18 may 2012
(Original post by maaa)
5i. y=af(bx) where a= 3 and b= 2
ii. Transforming graphs: point A is (-2,-4), point B is (0,-4), point C (4,-4) and point D is (6, but the y coordinate is unknown)

6i. Just proving that the root lies between x=0 and x= pi/2
ii. Using Raphson Method twice. First time, x=0.5 and second time, x=0.586 (3sig fig) using x=0 as the first value.

7. This question I found was very intimidating because I had to differentiate such a long equation. My overall answer was 9y-4x-14=0 in the form that they wanted. If you want the answers in more detail, please ask!

8a. It was to prove a trig identity, which was ok.

b. I know my answers are wrong so I will not give it!

I got 4x-y-2=0 for this q, when I first saw it I thought it looked nasty but it actually wasn't too bad There were 4 answers for the last question because it was 2 theta. I loved this paper!