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# The Edexcel C3 (14/06/12 - AM) Revision Thread Tweet

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IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
1. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
Hi, another question, f(x)=3x/x+1 - x+7/x^2-1 show that f(x)=3 - 4/x-1

I'm normally good at these, but I can't show that! I keep getting 3x-7/x-1 HELP!!!
Thanks
2. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by JenniS)
Hi, another question, f(x)=3x/x+1 - x+7/x^2-1 show that f(x)=3 - 4/x-1

I'm normally good at these, but I can't show that! I keep getting 3x-7/x-1 HELP!!!
Thanks
You're right. You just haven't finished there, you just have to use long division then you get what they want. So with long division divide 3x-7 by x-1.

Once you've done that you get 3- 4/(x-1)
3. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by 0range)
You're right. You just haven't finished there, you just have to use long division then you get what they want. So with long division divide 3x-7 by x-1.

Once you've done that you get 3- 4/(x-1)
omg thanks! actually wouldn't have thought to do that oh dear. but it makes sense thanks!
4. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
can anyone integrate this for me please? I cant seem to be able to do it. Tried integrating it with the substitution method but i cant seem to get the right answer lol

5. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
Anyone think something similar to Q8 in the Jan 07 paper could come up again? I was literally staring at that question for like 15mins then just switched to examsolutions :P

Apparently less then 10% of the people sitting the exam got that right 0.0

(Original post by JenniS)
omg thanks! actually wouldn't have thought to do that oh dear. but it makes sense thanks!
You're welcome
6. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arnab)
can anyone integrate this for me please? I cant seem to be able to do it. Tried integrating it with the substitution method but i cant seem to get the right answer lol

Yes, but this is a C4 question and should be on a C4 thread.
7. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
Anyone have a list of ALL the trigonometric identities we need for C3?
8. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arnab)
Thanks......anyone else care to confirm this?
hey, u can get 2004 and 2005 papers from http://www.xtremepapers.com/papers/AQA/Maths/ this link..
9. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by reetkang)
hey, u can get 2004 and 2005 papers from http://www.xtremepapers.com/papers/AQA/Maths/ this link..
its AQA
10. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by masterhr1)
Anyone have a list of ALL the trigonometric identities we need for C3?
The ones that are not in the booklet as well
11. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arnab)
The ones that are not in the booklet as well
The summary sections of the trig chapters in the textbook gives all the trig identities needed. Personally, I think it easier to derive these from the ones provided in the Formula Book, rather than trying to remember them all. If you're do lots of trig questions they begin to stick anyway (for a while at least).
12. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
I'm pretty much going to have to go bak to basics, and just work of the textbook, past papers are way too hard for some reason, I was flying through them 2 weeks ago, then I took a two week break, now I can barely do the first question on the freaking paper!!!
13. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
Don't you just love trigonometry?
14. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by 0range)
Anyone think something similar to Q8 in the Jan 07 paper could come up again? I was literally staring at that question for like 15mins then just switched to examsolutions :P

Apparently less then 10% of the people sitting the exam got that right 0.0

You're welcome
I was trying to see why the answer was like that for ages and then realised I read the question as arccos rather than arcsin, and then it was so clear all of a sudden...I feel stupid.
15. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
Can somebody please explain Q8 IN JAN 07 paper? Iv tried examsolutions be he uses a cast diagram and I have never used / heard of his method?
16. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by 0range)
I'm pretty much going to have to go bak to basics, and just work of the textbook, past papers are way too hard for some reason, I was flying through them 2 weeks ago, then I took a two week break, now I can barely do the first question on the freaking paper!!!
Im with you!! Tried to sort my papers into topics....but i seem to be having to check stuff up on pretty much every question :/ And i just dont have the motivation to go through the entire book in a few days :/
17. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by XxAmxX)
Im with you!! Tried to sort my papers into topics....but i seem to be having to check stuff up on pretty much every question :/ And i just dont have the motivation to go through the entire book in a few days :/
I know exactly how you feel!, I've already done that once on my own, and am definitely not doing that again. Atm I'm just doing the review exercises in my book and seeing how they do it on the CD, it does help but the questions on the papers just seem much harder :s
18. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
is an x4 equation a parabola like x2 or is it something else?
19. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by 101101)
Can somebody please explain Q8 IN JAN 07 paper? Iv tried examsolutions be he uses a cast diagram and I have never used / heard of his method?
Do you mean 8 ii) part a) and b)? I think 8 i) is fairly standard. Do you know that

It's the same for cos and tan.
20. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by masterhr1)
is an x4 equation a parabola like x2 or is it something else?
It's similar in shape, but it's not a parabola.
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