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# WJEC C3 Mathematics 1/06/2012 Tweet

Maths exam discussion - share revision tips in preparation for GCSE, A Level and other maths exams and discuss how they went afterwards.

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1. WJEC C3 Mathematics 1/06/2012
How did everyone find today's paper? I thought it was really quite different to previous papers, but not too bad overall as long as you knew your stuff.

I have for once taken the paper away with me so might be able to help with the answers / write up an unofficial markscheme, though will need the help of others for answers as I'm not too sure about some of them.

I messed up on 1b) because I rushed it. I wrote the integral of e^3 as e^3 / 3 instead of e^3x. Might still get a method mark for splitting the integral up though.
Last edited by Astonix; 01-06-2012 at 10:50.
2. Re: WJEC C3 Mathematics 1/06/2012
(Original post by Astonix)
How did everyone find today's paper? I thought it was really quite different to previous papers, but not too bad overall as long as you knew your stuff.

I have for once taken the paper away with me so might be able to help with the answers / write up an unofficial markscheme, though will need the help of others for answers as I'm not too sure about some of them.

I messed up on 1b) because I rushed it. I wrote the integral of e^3 as e^3 / 3 instead of e^3x. Might still get a method mark for splitting the integral up though.
would it not be just splitting the integral to e^3 x e^x^2 and then taking e^3 out because its just a number the doing e^3 x the integral of e^x^2?
3. Re: WJEC C3 Mathematics 1/06/2012
would it not be just splitting the integral to e^3 x e^x^2 and then taking e^3 out because its just a number the doing e^3 x the integral of e^x^2?
Yer, I think you can do that too.
4. Re: WJEC C3 Mathematics 1/06/2012
Overall i found the paper pretty easy, the way they set the questions was different to before but as you said if you knew your stuff it was pretty straight forward. the only one that there me slightly was question 9. Other than that happy .
5. Re: WJEC C3 Mathematics 1/06/2012
What did people get for the stationary point, f^-1(x) and d2y/dx2? I got (-1, 8) for the point and 1/(cos(at))^3 for the second derivative.
6. Re: WJEC C3 Mathematics 1/06/2012
I felt it went pretty good, they included some odd arrangements especially with the counter example, although I used 2 different value for each variable.

Q10 was easy although I dropped a mark by not putting +- 2

Q9b (i) was the only real one I considered having a problem with, for some reason i couldn't get x by on its own as it was multiplying the y, if only i'd take x out as a common factor -.-

Q1b i didn't have a clue to do, should have practiced them style questions in hindsight, I added 3 to the answer for part a haha :P
7. Re: WJEC C3 Mathematics 1/06/2012
i got the stationary point as (-1/2, 8) :/
8. Re: WJEC C3 Mathematics 1/06/2012
Yeah i got (-1/2,8) as well. what was the differential of 5x^2sin-1?
9. Re: WJEC C3 Mathematics 1/06/2012
I thought that was a horrible paper!
10. Re: WJEC C3 Mathematics 1/06/2012
Do you guys think the boundary will go down for an A? I hope so.
11. Re: WJEC C3 Mathematics 1/06/2012
(Original post by Biffmanz)
.
Biffmanz loved it.
12. Re: WJEC C3 Mathematics 1/06/2012
for finding an expression for f^-1 my x values cancelled which i know isn't right, what did people get? :/
13. Re: WJEC C3 Mathematics 1/06/2012
would it not be just splitting the integral to e^3 x e^x^2 and then taking e^3 out because its just a number the doing e^3 x the integral of e^x^2?
Yeah, that's what I did, so you just multiplied e^3 by your answer for a, right?

(Original post by idigdn91)
for finding an expression for f^-1 my x values cancelled which i know isn't right, what did people get? :/
I got f^-1(x)= negative root of (3-5x/x-1) ??

What did everyone get as the Range of f in question 9?
14. Re: WJEC C3 Mathematics 1/06/2012
i got something like 1, 3/5
15. Re: WJEC C3 Mathematics 1/06/2012
(Original post by clubs93)
Yeah i got (-1/2,8) as well. what was the differential of 5x^2sin-1?
Product Rule, let u=5x^2 v=sin^-1x
16. Re: WJEC C3 Mathematics 1/06/2012
(Original post by ThreeCheers)
Yeah, that's what I did, so you just multiplied e^3 by your answer for a, right?

I got f^-1(x)= negative root of (3-5x/x-1) ??

What did everyone get as the Range of f in question 9?
I think I had [0.6,1) as the range, as the f(x) was (x^2+3)/(x^2+5) and the domain was [0, infinity)
17. Re: WJEC C3 Mathematics 1/06/2012
what did everyone get for the parametric question, i got like -tanx (or whatever the variables were? also what about the proof for counter example. i put feta = 90 and alpha = 270 and got it i think - didnt get it till the last minute though!
18. Re: WJEC C3 Mathematics 1/06/2012
what did everyone get for the parametric question, i got like -tanx (or whatever the variables were? also what about the proof for counter example. i put feta = 90 and alpha = 270 and got it i think - didnt get it till the last minute though!
for the parametric i think if i remember correctly I had -atanax or something similar to that.. for counter example i put theta=0 and the other one equal to 5, both of the equations were proven wrong so i'm guessing I did the question right!
19. Re: WJEC C3 Mathematics 1/06/2012
(Original post by ThreeCheers)
Yeah, that's what I did, so you just multiplied e^3 by your answer for a, right?

I got f^-1(x)= negative root of (3-5x/x-1) ??

What did everyone get as the Range of f in question 9?
yeah i did
20. Re: WJEC C3 Mathematics 1/06/2012
yeah i had that for parametric!

for counter example did you got have to make it so the answers for sin came out the same with the two constants, but the answers for cos to be different?
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