You are Here: Home >< Maths

# Edexcel C3,C4 June 2013 Thread watch

1. Help needed with integration! please give me the steps on integrating this. tan(2x - π/6) with lower limit 0 and upper limit π/12. how can i get the answer 1/4 ln3.
2. When differentiating y = 2x x 4x, I get 22x(3ln2), yet the book says the answer is 23x(3ln2).

Can anyone explain how to get the right answer?
3. can they ever ask us to rotate something more/less than 2pi radians? any examples of questions or explanations on what they would ask and how to go about it?

(Original post by TeddyBasherz)
Does anyone have a link to the jan 2013 c4 paper? The booklet version not the version on examsolutions? Thanks
http://eiewebvip.edexcel.org.uk/Repo...s_20130307.pdf
4. hi how do I integrate

thanks

ps that is 2^2-2x -1

Posted from TSR Mobile
hi how do I integrate

thanks

ps that is 2^2-2x -1

Posted from TSR Mobile

have you tried using sub method? so assume u=2-2x ?
hi how do I integrate

thanks

ps that is 2^2-2x -1

Posted from TSR Mobile
rewrite as and should be simple from there
7. (Original post by otrivine)
have you tried using sub method? so assume u=2-2x ?
no I haven't ill give that a go now, thanks
didn't even think of that oops

Posted from TSR Mobile
8. (Original post by TDL)
rewrite as and should be simple from there
do you think if you use a sub method? is okay
9. (Original post by TDL)
rewrite as and should be simple from there
sorry could you explain how you got that?

Posted from TSR Mobile
10. Does anyone know how to integrate 2^x???? Is it always 2^x/ln2? (say: if y=4.5^t does the integral = 4.5^t/ln4.5)?
11. http://www.examsolutions.net/a-level...1&solution=4.4

why and where did he get the 2 from?
12. where can i get past replacement papers?
sorry could you explain how you got that?

Posted from TSR Mobile
sure

full solution

Spoiler:
Show

take the derivative of that and you'll get notice that this can be written as which then tells you that

hope this helps
14. (Original post by ITomI)
u = cosx
no I haven't ill give that a go now, thanks
didn't even think of that oops

Posted from TSR Mobile
did it work with sub method??
16. (Original post by silentriver)
Help needed with integration! please give me the steps on integrating this. tan(2x - π/6) with lower limit 0 and upper limit π/12. how can i get the answer 1/4 ln3.
I think your answer is wrong btw. I checked on my calculator and got 1/2 ln(root3/2). Anyway, I wrote it as the integral of sin(2x-pi/6)/cos(2x-pi/6), and then manipulated it to get it in the form: integral of f'(x)/f(x). You'll get an ln function for your result, and then sub your limits.
17. (Original post by physicso)
Does anyone know how to integrate 2^x???? Is it always 2^x/ln2? (say: if y=4.5^t does the integral = 4.5^t/ln4.5)?
This should help (it's similar)

(Original post by TDL)
sure

full solution

Spoiler:
Show

take the derivative of that and you'll get notice that this can be written as which then tells you that

hope this helps
18. (Original post by otrivine)
did it work with sub method??
I couldn't do it but probably because I suck at C4 haha

Posted from TSR Mobile
19. (Original post by TDL)
sure

full solution

Spoiler:
Show

take the derivative of that and you'll get notice that this can be written as which then tells you that

hope this helps
thank you so much, hope nothing like this comes up!

Posted from TSR Mobile

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: September 24, 2013
Today on TSR

### Edexcel C4 Maths Unofficial Markscheme

Find out how you've done here

### 2,269

students online now

Exam discussions

### Find your exam discussion here

Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE