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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. Could someone recommend a very tricky past paper? I haven't really done any past papers, rather just done the past paper questions for each topic.
2. (Original post by BrainJuice)
I'm technically in year 12 since I'm resisting most modules, does anybody know if I can retake C4 if I don't do well enough?
Yep, you can retake A2 for at least three years, maybe four I think Good luck for tomorrow anyway, believe in yourself!
3. (Original post by Simple Harmonic)
What paper is that?
June 2013 question 4, really would appreciate if someone could explain!
4. (Original post by Hollie G)
Anyone else given up by this point?
Very easy to feel like that on the night before, but don't. Keep going for a bit longer (or go to sleep if you want really) doing last minute work, and just try your best tomorrow. It is stressful and tiring, I know.
5. Hey guys,
Are there any proofs or tricky formulae we have to learn? For instance I didn't know before that integration 2^x gave 2^x/ln2
Is there anything like that beyond the obvious?
Thanks I did really badly in c3 so need to ace this to get into uni
6. (Original post by virufa)
Attachment 555707

Can someone please explain how to integrate this?? I know it's probably easy but please explain the steps.

Thanks.
You have to split it up as though it was partial fractions and then it will be easy to integrate. HINT: the answer will be natural logs.
7. (Original post by virufa)
Attachment 555707

Can someone please explain how to integrate this?? I know it's probably easy but please explain the steps.

Thanks.
Start by using partial fractions
8. (Original post by M&F)
yh I know but try to do this question 7c in this paper you will see what I mean you cant I do A-OC you have to do OC - A.

If you do understand that please let me know I dont get it. I might be missing something
https://5c59854d0ccd29d489c9e5e689a8...%20Edexcel.pdf
Alright will do, do you have the markscheme for me to check tho
9. (Original post by ThatExamWas)
Could someone recommend a very tricky past paper? I haven't really done any past papers, rather just done the past paper questions for each topic.
June 2014, it was very icky towards the end. Not sure how 2015 compares as I didn't sit that one
10. (Original post by virufa)
Attachment 555707

Can someone please explain how to integrate this?? I know it's probably easy but please explain the steps.

Thanks.
Partial fractions?
11. (Original post by Hollie G)
Anyone else given up by this point?
I feel ya.

This is my last exam though, this time tomorrow I am free!!
12. (Original post by minjinoor)
can someone pleeease explain the addition rule shenanigans used when integrating for eg,

sin3xcos2x

sorry, i've completely forgotten the working behind this
use trig identities, in this case sin(a+b)

Sin(3x+2x)=sin3xcos2x+cos3xsin2x equation 1

Sin(3x-2x)=sin3xcos2x-cos3xsin2x equation 2

1+2 =2sin3xcos2x so intergrate :1/2{ sin(3x+2x)+sin(3x-2x) }

= intergate 1/2{ sin(5x)+sin(x)} = -1/10cos(5x) -1/2cos(x) +c
13. (Original post by Pavinder100)
what's the hardest paper?

14. The thing that's always annoyed me is how well I'll do in past papers, getting almost full marks in them, then exam comes round and I completely flop.
15. Do we need to learn any proofs for this exam??
16. Can someone explain whether finding the angle is AB or BA
17. (Original post by coolguy123456)
Partial fractions then integrate
(Original post by Ben4)
split it into partial fractions
Thanks guys, I seriously need a slap
18. (Original post by Supermanxxxxxx)
Attachment 555705
Anyone explain how you get from the 2(4ln2)^2 value to 32(ln2)^2

Posted from TSR Mobile
Because 4^2 times by 2= 32
19. (Original post by Supermanxxxxxx)
Attachment 555705
Anyone explain how you get from the 2(4ln2)^2 value to 32(ln2)^2

Posted from TSR Mobile
2(4ln2)^2 is the same as 2(4^2)(ln2)^2 is the same as 2(16)(ln2)^2 is the same as 32(ln2)^2
20. (Original post by TSRPAV)
use trig identities, in this case sin(a+b)

Sin(3x+2x)=sin3xcos2x+cos3xsin2x equation 1

Sin(3x-2x)=sin3xcos2x-cos3xsin2x equation 2

1+2 =2sin3xcos2x so intergrate :1/2{ sin(3x+2x)+sin(3x-2x) }

= intergate 1/2{ sin(5x)+sin(x)} = -1/10cos(5x) -1/2cos(x)
thank you!

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